Why can't mammal's breath underwater

Why can't mammal’s breath under water and fish can?

Mammal’s can’t breath underwater because they don’t have gills to help breath.Fish have gills to  help them sense and breath underwater,Sharks are  linked to fish because they have gills to do the same thing.

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At the tournament i had to join the year 7&8 team because there wasn’t enough players that are over 50’s. We played at marist rugby club the first team we vers was glenbrae they were a little bit competitive but they didn’t play dirty so we had a good game losing. The next team we played were st pires they were rough as they hit me in the stomach and william got slapped on the eye and cavhyon got hit in the stomach to. The next it was mixed there was glenbrae and st pires together but only 7 players were allowed to play and we only had two glenbrae players on our side. It was a cool game we had a good time playing those games.