What layer of the atmosphere is the most dense?

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.

During endocytosis, cells expel what they don't need take in what they need shrink due to loss of water

Building glycogen from glucose molecules is an example of what