Question

this food web is from an ocean ecosystem in the ross sea, off the coast of antarctica. which of the following organisms eat a tertiary consumer in this food web? select all that apply. crabeater seal silverfish icefish

Explanation:

Step1: Identify tertiary consumers

In the food - web, tertiary consumers are organisms that eat secondary consumers. Analyze the food - web connections. Krill are primary consumers (eat diatoms etc.), microzooplankton can be primary or secondary consumers. Emperor penguins and Adélie penguins are secondary consumers (eat krill etc.). Crabeater seals are tertiary consumers as they eat krill which are primary consumers and are at a higher trophic level in the context of this food - web.

Step2: Check who eats the tertiary consumer

Looking at the arrows in the food - web, there are no arrows pointing from silverfish or icefish to the crabeater seal. There are no organisms in the given options that eat the tertiary consumer (crabeater seal).

Answer:

None of the above (since no organism in the options eats the tertiary consumer crabeater seal)