AMSCO Vocabulary Chapter 4

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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 (CO₂ + H₂O), such as plants.

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Heterotrophs

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Organisms that cannot produce their own food and rely on consuming other organisms.

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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 available for other organisms in an ecosystem through photosynthesis.

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Consumers

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Organisms that obtain energy by feeding on other organisms.

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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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Omnivore

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An animal or person that eats a variety of food of both plant and animal origin.