Whales originally evolved from a dog looking creature. Over thousands of years, the nose of the species continually moved to the top of its head. Which is why the current evolution of whales have the blowhole on the their head.
yes
Only one. The same as every whale or dolphin.
Because they are whales and they need to breath.
Whales blow holes are similar to our noses. They allow the whale to breath by coming to the surface. Its basically like a nose on top of the whales head, and is evolved from a nose like ours.
On the top of their heads.
assuming parachutists don't have holes in their heads.
They sure do.
Yes, they do.
Blowhole
Humpback whales breathe air by using their lungs. They can only breathe in when their blowhole is above the surface of the water. When they exhale, you can see a spout of warm moist air shoot upwards from their blowhole.
Whales have a blow hole so they could breath when they sufarce
Yes, black whales do have blow holes. They keep them closed when they are underwater.