Which group would be classified as primary consumers in a basic mammal food chain?

• A. Plants
• B. Decomposers
• C. Herbivores
• D. Apex predators

Answer: (C)

Primary consumers are the organisms that eat producers, typically plants. In a basic mammal food chain, plants capture energy from the sun and serve as the energy source for the ecosystem. The herbivores that eat those plants are the first group to obtain energy from plants, so they occupy the primary consumer level. Think of animals like rabbits or mice munching on grasses and seeds—that’s herbivory feeding on plants. After them come secondary consumers that eat herbivores, and apex predators at the top. Decomposers break down dead material and help recycle nutrients, but they aren’t classified as primary consumers. So the group that fits as primary consumers is herbivores.