Answer 1:
Good question. Yes, the blowhole is connected
to the lungs by a windpipe (trachea). The
blowhole is the same thing as your nostrils (the
holes in your nose). The ancestors of whales and
dolphins were land mammals. Mammals that spend a
lot of time in the water, like beavers, often
evolve nostrils that are high up on their heads.
This way they can stay mostly underwater and still
breathe.
When a whale or dolphin is developing, long
before it is born, its nostrils start out on the
end of its nose. As it develops inside its
mother, the nostrils move to the top of its head.
The babies are born with a blowhole. You can see
pictures of this at:
picture . The picture labelled “embryo” is
younger than the pictures labelled “fetus.”
What other changes would a land mammal need
in order to become adapted to living in the water
all of the time?
If you are interested in questions like these,
you may want to study anatomy or marine biology.
Thanks for asking,
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