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

alright i will show you where to find the answers but only number six is missing i hope this will you and others

step one open a new page and type in:

1.13 graded assignment: write an evaluation of an argument

then click on the first one you see

second once on the page scroll down then behold the answers.