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Ecosystem

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A biological community of interacting organisms and their physical environment.

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Biomass

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The total mass of organisms in a given area or volume.

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Autotrophs

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Organisms that produce their own food from inorganic substances.

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Heterotrophs

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Organisms that obtain their food by consuming other living things.

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Trophic Levels

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The hierarchical levels in an ecosystem, comprising producers at the bottom and successive levels of consumers above them.

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Producers

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Organisms, like plants, that produce energy through photosynthesis.

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Consumers

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Organisms that consume other organisms for energy.

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Herbivore

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An animal that feeds on plants.

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Carnivore

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An animal that feeds on other animals.

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Food Chain

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A linear sequence of organisms through which nutrients and energy pass as one organism eats another.