Natural selection acts on variation by: a. allowing the bad genes to quickly spread through the population c. allowing the bad genes to slowly spread through the population b. allowing the good genes to slowly spread through the population d. allowing the good genes to quickly spread through the population

C, allows the good genes to slowly spread through the population.

Explanation:

Natural selection is when animals with the most beneficial traits survive and continue to reproduce, while others die off. It takes about a million years to change a trait, therefore is a slow process.

i can't see the full page, therefore, can't answer it

explanation:

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."