there were polar bears who hunted seals and protected their cubs from other polar bears
These polar bears hunted every day to feed themselves and their cubs. they hid in the white snow this is called camouflage it makes it easier for the bears to hunt.
In the arctic there was not enough snow which meant not enough ice.One winter there was not enough snow.All the snow melted some animals started to die because the lack of snow.
The animals of the arctic knew that they were in danger.So the animals left. This is called behavioral adaptation
after days of traveling the animals found a forest.There was water and snow for the wolf, trees for the birds but there was no large body or enough snow for the seals and bears.
Therefor the bear that came from the arctic died but the next generation of bears were smaller and with less fur which made it easier to live since there was no need of snow.this type of bear learned ho to survive and hunt.