What are consumer organisms

Consumer is a category that belongs within the food chain of an ecosystem. It refers predominantly to animals.

Consumers are unable to make their own energy, and instead rely on the consumption and digestion of producers or other consumers, or both, to survive.

Explanation:

they are organisms that obtain food by feeding on other organisms or organic due to the lack of ability to manufacture their own food from inorganic sources.

because photosynthesis could not occur (apex)