Unit 3 Vocabulary

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Resource

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A physical material that humans need and value such as land, air, and water.

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Food Web

Back

A diagram (model) that shows the feeding relationships between organisms in an ecosystem.

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Atmosphere

Back

The mixture of gases that surrounds Earth.

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Energy pyramid

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A model or tool that traces the flow of energy through an ecosystem.

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Pollution

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Any waste product or contamination that harms or dirties an ecosystem and harms organisms.

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Ecosystem

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A community of organisms and the environment in which they live.

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Photosynthesis

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The process by which green plant cells make food from sunlight, water, and carbon dioxide.

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Decomposer

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An organism that gets energy by feeding on dead materials and wastes.

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Food Chain

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A series of events in which one organism eats another and obtains energy.

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Organism

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Any living thing.