The Arctic cod, sea duck, and ringed seals equally feed plankton. If the plankton population would wipe out, then it would negatively affect these three species.
What is a food web?
A food web is a complex network of organisms, which may function as prey and/or predators in a given ecosystem.
In this case, plankton is the primary source of food (i.e., the autotrophic producers) for the ecosystem.
The Arctic cod, sea duck, and ringed seals feed plankton, thereby they can be considered as primary consumers of the food web.
Learn more about a food web here:
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