What does a heart need to function

Which of the following correctly list the first appearance of organism in the fossil record from earliest to most recent

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.

Does mitochondria still meet the definition of a eukaryote why or why not?