What gas causes climate change

What role does differential reproduction play in natural selection? ! a) some organisms have different reproductive success due to nongenetic traits. b) some organisms have traits that them reach reproductive age. c) different methods of reproduction result in some organisms being genetically altered. d) reproduction varies among organisms due to pathogenic factors. the answer is not a or d based on other posts.

As a small change in a person's dna can cause a genetic disorder

Are the earth's ocean floor and continents the same age geologically? why or why not?