by countershading
Adapt.
they use Blubber
they don't
because of their fat
there's a thing called google
They have always lived there, and so have evolved to that climate.
Whales returned to the sea from land because they evolved to adapt to the aquatic environment, where they found more food and less competition for resources.
It is called convergent evolution. When two different animals have to adapt to the same environment (both whales and fish have to adapt to marine environments) evolution will make them start to look similar, even though they will still retain fundamental differences. For example, whales are mammals, and fish are... fish
They have to adapt to different things. For example, they have to adapt to lack of food (krill mostly) and the change in the ocean ecosystem including the warming of oceans. This is because of excess climate change which is caused mostly by Human activity.
They Hunted whales, walruses, and seals. They developed the kayak.
They Hunted whales, walruses, and seals. They developed the kayak.
They Hunted whales, walruses, and seals. They developed the kayak.