Explain how some heterotrophs could be described as either a primary consumer or a secondary consumer.

Omnivorous animals can be described as a primary consumer or a secondary consumer.

Explanation:

Some heterotrophs can derive their nutrition from plant sources and animal sources both. These organisms are called omnivorous animals. When an omnivorous organism derives its nutrition from plant sources, it serves as a primary consumer. On the other hand, when the same omnivorous organism derives its nutrition from animal sources, it serves as a secondary consumer. Squirrels and rats are examples of such heterotrophs.

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.