Which is an example of a consumer in a food chain?

A herbivore that eats plants serves as a consumer in a food chain because it obtains energy by consuming living organisms, specifically plants, which are considered producers. In an ecological context, producers, such as plants, convert sunlight into energy through photosynthesis, forming the base of a food chain. Herbivores, as primary consumers, rely directly on these producers for their energy needs. They play a crucial role in the transfer of energy from plants to higher levels in the food chain, such as carnivores or omnivores that consume herbivores. Thus, this option accurately represents a consumer as it highlights the role of an organism that feeds on others for its energy requirements.