Adenosine triphosphate, or atp, is primarily used as in living organisms.

ATP is primarily used as a source of energy

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one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.