Question

1. the diagram shows an oceanic food web. at what trophic level do the killer whales primarily feed? a. the third trophic level only b. the second trophic level only c. the third and fourth trophic levels d. the first and second trophic levels

Explanation:

First, identify trophic levels. Producers like algae are at the first level. Primary consumers (herbivores) that eat producers are at the second level, such as krill. Secondary consumers that eat primary - consumers are at the third level, like cod. Tertiary consumers that eat secondary consumers are at the fourth level. Killer whales eat animals like crabeater seals, leopard seals, and elephant seals which are secondary or tertiary consumers themselves. So killer whales primarily feed at the third and fourth trophic levels.

Answer:

C. the third and fourth trophic levels