Which one of the following cannot produce its own energy and must rely on vegetation for survival?

The second trophic level is made up of primary consumers. They are also known as herbivores. They only eat primary producers, such as plants or algae. A grasshopper, for example, is a primary consumer in the Everglades.

Herbivores, which eat plants, are the primary consumers. Key consumers are caterpillars, insects, grasshoppers, termites, and hummingbirds. They cannot produce their own energy and must rely on plants and vegetation for survival.