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.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.  

the answer is d. none of the above