Final answer:
Consumers or heterotrophs are organisms that need to eat other organisms to obtain their nutrients, including animals, some bacteria, and fungi.
Step-by-step explanation:
Organisms that consume other organisms for food are called consumers or heterotrophs. These organisms cannot produce their own food through photosynthesis as autotrophs do, so they rely on the intake of organic molecules by consuming other living things. This includes all animals, some bacteria, and fungi. Heterotrophs can be further classified based on their diet as herbivores (eat plants), carnivores (eat animals), omnivores (eat both plants and animals), or decomposers (consume dead organic matter).