Ecology and Biological Processes

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biosphere

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the part of Earth where life exists; includes all of the living organisms on Earth

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cellular respiration

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the process by which cells use oxygen to produce energy from food

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decomposer

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an organism that gets energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients

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nutrient

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a substance in food that provides energy or helps form body tissues and that is necessary for life and growth

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photosynthesis

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the process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to make food

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abiotic factor

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an environmental factor that is not associated with the activities of living organisms

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biotic factor

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an environmental factor that is associated with or results from the activities of living organisms