An organelle found in most eukaryotic cells described as cellular power plants because their primary function is to convert materials into energy in the form of atp

This kind of cell does not have a large central vacuole. ... An organelle found in most eukaryotic cells described as "cellular power plants", because their primary function is to convert organic materials into energy in the form of ATP. Nucleolus. This organelle, found in the nucleus, produces ribosomes.

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well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."