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| The science of relationships between organisms and their environment. |
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| Organisms fill a niche in the environment which provides for the needs of other organisms; they may provide food or shelter. |
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| Uses the sun, water and carbon dioxide to make sugars in the process of photosynthesis for other organisms to eat; also called autotrophs. |
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| an organism that eats other organisms as theri food source;also called heterotrophs. |
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| Organisms that break down dead or decaying matter and return the nutrients to the environment. |
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| Plants and protists are __________ which make the food for other organisms. |
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| The student of food chains and other ways organisms interact with their environment is called ___________. |
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| Bacteria and fungi are ____________ that break down dead organisms. |
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| Frogs are __________ in a pond ecosystem. They eat other organisms. |
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| The groups of producers, consumers, and decomposers in a food web are the ____________ in a food web. |
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