Which is true of all animals?

All animals are eukaryotic, multicellular organisms, and most animals have complex tissue structure with differentiated and specialized tissue. Animals are heterotrophs; they must consume living or dead organisms since they cannot synthesize their own food and can be carnivores, herbivores, omnivores, or parasites.

Explanation:

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

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