which of the following is an example of an effect of natural selection?

Question

All of the children of two parents are male.
Carbon cycles through ecosystem.
Favorable environmental conditions cause an increased food supply.
Polar bears have white fur.

Is the answer C?

Answer 1

No. I vote for D.

Answer 2

how so exactly? since it is a benifit to the polar bear that it has white fur? I don't quite understand the definition of natural selection.

Answer 3

Natural selection means that organisms choose to mate with other organisms that have characteristics that help them survive. A polar bear's white fur helps it blend into the ice and snow in its environment.

http://evolution.berkeley.edu/evolibrary/article/evo_25

Answer 4

oh i see, thank you!:)

Answer 5

:-) You're welcome.