This document lists various organisms from different levels of the food chain, including producers like grass, wheat, and phytoplankton; primary consumers such as squirrels, rabbits, frogs, and worms; secondary consumers including wolves, hawks, sharks, and foxes; tertiary consumers like bears and humans; and decomposers such as bacteria and fungi. The list encompasses plants, animals, and other organisms that interact with and depend on one another in both terrestrial and aquatic ecosystems.
