A mouse is classified as a primary consumer heterotroph.
Heterotrophs are organisms that cannot produce their own food and rely on consuming other organisms for energy. They can be further divided into different categories based on their diet. Mice primarily eat plants, seeds, and fruits, placing them at the primary consumer level in the food chain. This means they directly consume producers (plants), which makes them a vital link in the ecosystem as they connect the energy flow from producers to higher-level consumers like predators.