Tuna are predatory fish that consume smaller,carnivorous fish that have fed on zooplankton.The zooplankton had fed on phytoplankton.When a person eats tuna,he or she is consuming the ________ trophic level of the food chain.

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Tuna are at the fourth trophic level: 1) Phytoplankton (first level, producers), 2) Zooplankton (second level, primary consumers), 3) Small carnivorous fish (third level, secondary consumers), 4) Tuna (fourth level, tertiary consumers).

Tuna Are Predatory Fish That Consume Smaller,carnivorous Fish That Have