Which of the following examples likely occurred through natural selection?
a. some humans have hair on the middle part of their fingers, while others do not.
b. giraffes have longer necks than their ancestors.
c. in a litter of puppies, some puppies have brown fur while others have black fur.
d. there are several colors of roses, such as red, white, pink, and yellow.

this is a good question! i'll do some research and come back when i have the answer!

since there isn't any suggested answers i will give you the reason and hopefully you can figure it

south africa, or rather all of africa, has not been in the location in which it is nowadays throughout the geological past. after the super-continent pangaea started to break apart, gondwanaland, in which was africa, moved further south, and parts of it came to be very close to the south pole. because the climate in this part of the world is very cold due to the very dispersed sun rays in there, what is now south africa, started to freeze, and the conditions were right for the formation of glaciers. the glaciers existed up until the period when gondwanaland started to break apart and what is now africa started to move towards north, sp it warmed up and the glaciers melted.