Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

The illustration is missing the type of organisms known as decomposers. They break down dead animals and plants and have the vital role in returning the nutrients back into the system, where they can be used once more by the primary producers.

In the illustration:

The primary producers are the phytoplankton.

The primary consumers are the: krill, cod and zooplankton

The secondary consumers are the remaining species that feed on the primary consumers.

oxygen +1 most likely