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| all parts of Earth in which life exists |
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| study of the relationship between living organisms and its surroundings |
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| organisms that can breed and produce fertile offspring |
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| same species in the same area |
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| different populations in same area |
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Definition
| organisms that live in the same physical environment |
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| a group of ecosystems that share similar climates and typical organisms |
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Definition
| any living part of an environment |
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Definition
| any nonliving part of an environment |
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| organism that makes its own food |
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| using light energy to make food |
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Definition
| using chemical energy to make food |
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| gets energy from other organisms |
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| organism that kill and eat other animals for energy |
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| eats dead animals for energy |
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| eats plants and animals for energy |
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| breaks down organic material |
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| a series of steps in which organisms transfer energy by eating and being eaten |
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| producer that makes algae |
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Definition
| a network of feeding interactions |
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Definition
| tiny herbivore that eats algae |
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Definition
| each step in a food chain or food web |
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Definition
| showing the transfer of energy |
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Definition
| the total amount of living tissue within a given trophic level |
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| when elements pass from one organism to another |
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| the chemical substances that an organism needs to sustain life |
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Definition
| when the bacteria converts nitrogen gas into ammonia |
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Definition
| when nitrogen is broken apart and sent back into the atmosphere |
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Term
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Definition
| the nutrient whose supply limits productivity |
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