BiOLOGY...???

[Minoin]

How do the small ears of a polar bear help it to survive?
Also, what is in their mother's milk that helps to keep them warm as babies?

[WinnieESewell]

Ear is a sense organ for hearing, it plays limited role in survival.
Milk contains FAT. Rest is tactics of finding a right hibernating place !

[Minnie]

<<< How do the small ears of a polar bear help it to survive?

Ears stick out and so tend to lose heat fast. Small ears stick out less and so lose less heat.

<<<<Also, what is in their mother's milk that helps to keep
<<<< them warm as babies?

Nothing speciesl. Just the normal stuff you find in the milk of all mammals. Fats and sugars mostly.

[Belasius]

Since polar bears live in cold climates, hence they have evolved mechanisms to conserve the heat loss from their body. For instance they have a thick fur to conserve heat loss through the body, for the same reason they have smaller ears (notice sometimes how your ears turn red when you blush, or after a hot bath).

Mother's milk doesn't have anything special to keep them special. However polar animals have higher amounts on brown fat that keeps their body temperatures constant my uncoupling the reactions in the body that create ATP thereby releasing energy.