Answer:
The correct answer is - plankton, Fish, krill, whales.
Step-by-step explanation:
In the Antarctic ecosystem, different kinds of organisms present that can be understood by the food web available there. The food web is very complex in the Antarctic ecosystem. Phytoplanktons are producers in this food web and krill are primary consumers.
Krills are important animals of this ecosystem as most of the secondary consumers including fishes, baleen whales, penguins, and seals and many birds are feeding on krill. The various species eat fish, penguins, squid, and krill.