Natural selection is defined as a. the changes that occur in a population that do not affect survival. b. the changes in the characteristics within a population that lead to survival c. the changes that occur in an organism over it's lifespan. d. the process by which humans select the most desirable organisms in population

The answer is B, natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.

can you list the answers so i can answer

fe 55.85 g/mol and h2o 18.02 g/mol.