Yes, they do have blow holes instead of gills, because they are mammals they are air breathers, which means they have lungs.
no they have blow holes used to breathe by going up to the surface.
yes
Yes
To breathe.
holes that fish use to breath
Sharks unlike whales breath through gills and do not have a blow hole scince they are adapted to go really deep down if a whale went really deep down it would not be able to come back up for air scince it would run out of time
They have lungs. They go up to get air and then close their blow holes so water can't go in and they can hold it for more than a hour.
To breathe
Fish do not breathe through their mouth like humans. They have gills which the use to filter the oxygen from the water.
Impossible to answer
Yes.