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Practice problem

Autotroph — Definition & Examples

By Hannah Bonville
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Use the food web below to answer the question that follows.

The food web shows phytoplankton and two types of vegetation on the bottom level. Then invertebrates, small fish, and shell fish. Finally, there are larger fish and birds.

Image source: By Matthew C. Perry [Public domain] via Wikimedia Commons

What is the initial energy source for the organisms in the food web?

Choose one answer

Type a concept, like “slope” or “photosynthesis”.

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