Question

this food web is from an ocean ecosystem in the ross sea, off the coast of antarctica. which organisms are both secondary consumers and tertiary consumers in this food web? select all that apply. icefish emperor penguin crabeater seal

Explanation:

Step1: Define consumer levels

Secondary consumers eat primary - consumers, and tertiary consumers eat secondary - consumers. We need to trace the food - web connections.

Step2: Analyze icefish

Icefish eat silverfish (primary consumers) and are eaten by emperor penguins. They also eat other small organisms, making them secondary consumers. They can also be tertiary consumers as they are part of longer food chains in the web.

Step3: Analyze emperor penguin

Emperor penguins eat icefish (secondary consumers), so they are tertiary consumers. They also eat other organisms like krill (primary consumers), making them secondary consumers as well.

Step4: Analyze crabeater seal

Crabeater seals eat krill (primary consumers), so they are secondary consumers. They are also part of higher - level food chains and can be tertiary consumers.

Answer:

icefish, emperor penguin, crabeater seal