Albinism is cause by the expression of a recessive allele. In order for an animal to be albino, it must possess two copies of the recessive allele for albinism.
The climate of Antarctica was probably much warmer in the past than it is today.
Explanation:
There are little things living there now. Coal takes millions of years to form. There must have been much more living things there in the past (when it was warmer) to make coal.
