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A consumer is anything that takes organic material and transforms (digests) it into energy. We are consumers because we eat plants and animals, but almost all plants are not consumers -- they are called producers. Decomposers like bacteria and fungi break down organic material for energy, so they are also consumers. However, unlike other consumers, they exist in all tropic levels. Because they are indiscriminatory with regards to what they consume, they can decompose plants as well as animals. This allows them to be primary consumers, secondary consumers, or tertiary/quaternary consumers; or exist in many levels simultaneously.

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15y ago

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