Can, could, couldn't and can't
dolphins -- breath underwater

Whales and dolphins are mammals and breathe air into their lungs, just like we do. They cannot breathe underwater like fish can as they do not have gills. ... After each breath, the blowhole is sealed tightly by strong muscles that surround it, so that water cannot get into the whale or dolphin's lungs.

Explanation:

the answer is can't

just add on too that

explanation:

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