The living world encompasses ecosystems, biomes, and their intricate interactions,... Show more
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Updated Feb 14, 2026
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AP Environmental Science Study Guide for Unit 1: Ecosystems and Biomes
T
tiannah gonzalez
@tiannahgonzalez_stry
1 / 9
Page 2: Ecological Relationships
This page delves deeper into various types of species interactions and relationships within ecosystems, particularly focusing on symbiotic relationships.
Definition: Symbiosis refers to close, long-term interactions between two species in an ecosystem.
Example: Clownfish and sea anemones demonstrate mutualism, where both species benefit from the relationship.
Vocabulary:
- Commensalism: One species benefits while the other is unaffected
- Parasitism: One organism (parasite) benefits while harming the host
- Competition: Organisms competing for limited resources
Highlight: Understanding different types of competition is crucial for ecosystem dynamics:
- Intraspecific competition occurs between members of the same species
- Resource partitioning helps species coexist by utilizing different parts of the environment
Page 3: Terrestrial Biomes and Climate
This page explores terrestrial biomes and their relationship with climate patterns, emphasizing the importance of environmental conditions in shaping ecosystems.
Definition: Biomes are large-scale ecological regions defined by climate, geology, soils, hydrology, and vegetation patterns.
Highlight: Hot, humid regions typically support greater primary productivity and biodiversity compared to cold or dry regions.
Example: Temperate seasonal rainforests exhibit all four seasons and are characterized by deciduous trees that change colors throughout the year.
Vocabulary:
- Climate: Long-term patterns of temperature, humidity, atmospheric pressure, wind, and rainfall
- Primary productivity: Rate at which energy is converted to organic substances by photosynthetic organisms
Quote: "Climate graphs show the relationship between annual precipitation and temperature across different biomes, from tundra to tropical rainforest."
Page 3: Terrestrial Biomes
The page details the classification and characteristics of land-based ecosystems, introducing the concept of biomes and their determining factors.
Vocabulary: Climate refers to long-term patterns of temperature, humidity, atmospheric pressure, wind, and rainfall in an area.
Highlight: Ecosystems are categorized into biomes and aquatic life zones based on climate, geology, soils, hydrology, and vegetation patterns.
Page 4: Grassland and Savanna Biomes
This section examines specific terrestrial biomes, focusing on savannas and grasslands, including their characteristics and distributions.
Definition: Savanna is a grassland biome with scattered trees found in tropical regions between deserts and rainforests.
Example: North American plains and prairies represent agricultural grasslands with sod-forming grasses.
Highlight: Shrublands feature shallow soil intermixed with small trees and spiny vegetation, typically found in coastal regions with hot, dry summers.
Page 5: Freshwater Ecosystems
The content covers various freshwater ecosystems and their importance to human society and environmental health.
Highlight: Freshwater systems are crucial for providing humans with water and food resources.
Definition: Wetlands are areas with water-saturated soil, shallow enough for emergent plants with roots in water.
Example: Lakes are lentic ecosystems (still water) with four distinct zones based on depth.
Page 6: Human Impact on Wetlands
This section addresses anthropogenic causes of wetland degradation and introduces the carbon cycle.
Vocabulary: Anthropogenic refers to environmental changes caused by human activities.
Example: Agricultural drainage, commercial fishing, and logging are major human impacts on wetlands.
Highlight: The carbon cycle involves exchanges between the biosphere, geosphere, hydrosphere, and atmosphere.
Page 7: Nitrogen Cycle
The page explains the nitrogen cycle and its importance in biological systems.
Definition: The nitrogen cycle is the cyclic movement of nitrogen between living organisms and the environment.
Highlight: Nitrogen comprises 78% of the atmosphere and is essential for making proteins and nucleic acids.
Vocabulary: Nitrogen fixation is the process of converting atmospheric nitrogen into biologically usable forms.
Page 8: Hydrologic Cycle
This section details the water cycle and groundwater systems.
Definition: The hydrologic cycle is the process where water moves between the atmosphere, oceans, lakes, rivers, and land.
Vocabulary: Aquifers are bodies of permeable rock that can contain or transmit groundwater.
Highlight: Approximately 70% of Earth's water is stored in oceans.
Page 1: Fundamental Ecosystem Concepts
This page introduces core concepts of AP Environmental Science and ecosystem structures. The content focuses on basic definitions and interactions within ecosystems.
Definition: An ecosystem is a community of living organisms interacting with their non-living environment as a system.
Vocabulary:
- Abiotic: Non-living components including atmosphere, hydrosphere, lithosphere
- Biotic: Living components including animals, plants, fungi, bacteria
- Population: Group of organisms of the same species
- Community: Different species populations in the same geographic area
- Habitat: Environment where an organism lives
- Ecological niche: Species' role in its environment
Example: Resource partitioning occurs when species share resources without conflict, demonstrating how organisms can coexist in the same environment.
Highlight: Symbiotic relationships play a crucial role in ecosystem functioning, with mutualism benefiting both organisms involved.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
AP Environmental Science Study Guide for Unit 1: Ecosystems and Biomes
T
tiannah gonzalez
@tiannahgonzalez_stry
The living world encompasses ecosystems, biomes, and their intricate interactions, forming the foundation of AP Environmental Science. This comprehensive guide explores terrestrial and aquatic ecosystems, biogeochemical cycles, and ecological relationships.
• The guide covers essential concepts from Unit 1... Show more
Page 2: Ecological Relationships
This page delves deeper into various types of species interactions and relationships within ecosystems, particularly focusing on symbiotic relationships.
Definition: Symbiosis refers to close, long-term interactions between two species in an ecosystem.
Example: Clownfish and sea anemones demonstrate mutualism, where both species benefit from the relationship.
Vocabulary:
- Commensalism: One species benefits while the other is unaffected
- Parasitism: One organism (parasite) benefits while harming the host
- Competition: Organisms competing for limited resources
Highlight: Understanding different types of competition is crucial for ecosystem dynamics:
- Intraspecific competition occurs between members of the same species
- Resource partitioning helps species coexist by utilizing different parts of the environment
Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
Page 3: Terrestrial Biomes and Climate
This page explores terrestrial biomes and their relationship with climate patterns, emphasizing the importance of environmental conditions in shaping ecosystems.
Definition: Biomes are large-scale ecological regions defined by climate, geology, soils, hydrology, and vegetation patterns.
Highlight: Hot, humid regions typically support greater primary productivity and biodiversity compared to cold or dry regions.
Example: Temperate seasonal rainforests exhibit all four seasons and are characterized by deciduous trees that change colors throughout the year.
Vocabulary:
- Climate: Long-term patterns of temperature, humidity, atmospheric pressure, wind, and rainfall
- Primary productivity: Rate at which energy is converted to organic substances by photosynthetic organisms
Quote: "Climate graphs show the relationship between annual precipitation and temperature across different biomes, from tundra to tropical rainforest."
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Page 3: Terrestrial Biomes
The page details the classification and characteristics of land-based ecosystems, introducing the concept of biomes and their determining factors.
Vocabulary: Climate refers to long-term patterns of temperature, humidity, atmospheric pressure, wind, and rainfall in an area.
Highlight: Ecosystems are categorized into biomes and aquatic life zones based on climate, geology, soils, hydrology, and vegetation patterns.
Sign up to see the contentIt's free!
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Improve your grades
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Page 4: Grassland and Savanna Biomes
This section examines specific terrestrial biomes, focusing on savannas and grasslands, including their characteristics and distributions.
Definition: Savanna is a grassland biome with scattered trees found in tropical regions between deserts and rainforests.
Example: North American plains and prairies represent agricultural grasslands with sod-forming grasses.
Highlight: Shrublands feature shallow soil intermixed with small trees and spiny vegetation, typically found in coastal regions with hot, dry summers.
Sign up to see the contentIt's free!
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Improve your grades
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Page 5: Freshwater Ecosystems
The content covers various freshwater ecosystems and their importance to human society and environmental health.
Highlight: Freshwater systems are crucial for providing humans with water and food resources.
Definition: Wetlands are areas with water-saturated soil, shallow enough for emergent plants with roots in water.
Example: Lakes are lentic ecosystems (still water) with four distinct zones based on depth.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Page 6: Human Impact on Wetlands
This section addresses anthropogenic causes of wetland degradation and introduces the carbon cycle.
Vocabulary: Anthropogenic refers to environmental changes caused by human activities.
Example: Agricultural drainage, commercial fishing, and logging are major human impacts on wetlands.
Highlight: The carbon cycle involves exchanges between the biosphere, geosphere, hydrosphere, and atmosphere.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Page 7: Nitrogen Cycle
The page explains the nitrogen cycle and its importance in biological systems.
Definition: The nitrogen cycle is the cyclic movement of nitrogen between living organisms and the environment.
Highlight: Nitrogen comprises 78% of the atmosphere and is essential for making proteins and nucleic acids.
Vocabulary: Nitrogen fixation is the process of converting atmospheric nitrogen into biologically usable forms.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Page 8: Hydrologic Cycle
This section details the water cycle and groundwater systems.
Definition: The hydrologic cycle is the process where water moves between the atmosphere, oceans, lakes, rivers, and land.
Vocabulary: Aquifers are bodies of permeable rock that can contain or transmit groundwater.
Highlight: Approximately 70% of Earth's water is stored in oceans.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Page 1: Fundamental Ecosystem Concepts
This page introduces core concepts of AP Environmental Science and ecosystem structures. The content focuses on basic definitions and interactions within ecosystems.
Definition: An ecosystem is a community of living organisms interacting with their non-living environment as a system.
Vocabulary:
- Abiotic: Non-living components including atmosphere, hydrosphere, lithosphere
- Biotic: Living components including animals, plants, fungi, bacteria
- Population: Group of organisms of the same species
- Community: Different species populations in the same geographic area
- Habitat: Environment where an organism lives
- Ecological niche: Species' role in its environment
Example: Resource partitioning occurs when species share resources without conflict, demonstrating how organisms can coexist in the same environment.
Highlight: Symbiotic relationships play a crucial role in ecosystem functioning, with mutualism benefiting both organisms involved.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Most popular content: Freshwater Biome
Most popular content in AP Environmental Science
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user