Which organism has fur and mammary glands, but does not have opposable thumbs?

A polar bear has paws without opposable thumbs but has mammary glands.

Chimpanzee.

Explanation:

All the primates have opposable thumbs and there are certain physical features that helps the primates to set apart from other animals.

They have large brains as compared to that of body. Males tend to be larger than females.

They have shortened snouts, have fingers, toes and nails instead of the claws. They have opposable thumbs that helps them to hold the object and manipulate the objects.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).