A food chain in an ecosystem flows from green algae, to freshwater snails, to small fish, and finally to large fish. Which organism is the primary consumer?

large fish
small fish
green algae
freshwater snails

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IS LArge Fish

Explanation:

Primary consumers are the animals in a food chain that feeds on plants, i.e., producers. In the figure, phytoplanktons are the producers that are consumed by small fishes, therefore small fishes are primary consumers. Large fishes are consuming primary consumers (small fishes), therefore they are secondary consumers.

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