Question

Which organism could occupy the tertiary consumer trophic level in a marine food chain?

Blue crab

Oyster

Phytoplankton

Zooplankton

Answer 1

Blue crab.

Zooplankton and Phytoplankton are incorrect answers as they would be closer to secondary or producer level (unsure of which). Oyster is also closer to secondary rather than tertiary as they do not hunt for food.

Therefore, through process of elimination, blue crab is the answer.

Hope this helps!