AP BIOLOGY

Detailed explanation-1: -3. Some animals like sharks are 5th order consumers! Sharks eat tuna that eat mackerel that eat herring that eat copepods that eat diatoms.

Detailed explanation-2: -Sharks like this one are apex predators. Apex predators eat other consumers. They may be at the fourth or fifth trophic level. They have no natural enemies except people.

Detailed explanation-3: -A shark is a tertiary consumer. An area has only a few top predators.

Detailed explanation-4: -Phytoplankton and algae form the bases of aquatic food webs. They are eaten by primary consumers like zooplankton, small fish, and crustaceans. Primary consumers are in turn eaten by fish, small sharks, corals, and baleen whales.