Answer:
A tertiary consumer is an organism that derives its energy and nutrients by eating primary and secondary consumers.
In a food web, tertiary consumers are at the top of the chain and occupy the fourth trophic level.
They are usually predators or apex predators like hawks, eagles, foxes, and large fish.
These organisms play an important role in the food web by helping to regulate the populations of lower-level organisms and maintaining a balance in the ecosystem.