Which geologic principle is the reason rock layers typically form parallel to each other?
a, cross-cutting relationships

b, original horizontality

c, superposition

d, unconformities

me if u know the answer

the correct answer is:

a population changes in response to a change in the environment.

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: