Natural selection is a process by which organisms that are better adapted to their environment tent to

breed, while the ones not so well adapted die off.

the answer to your question is tooth decay.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: