Question 20 of 30 If a scientist's data are contaminated, what is the best course of action?
A. The scientist should restart the experiment at a step prior to
contamination.
B. The scientist should draw conclusions based on the contaminated
data
C. The scientist should continue with the experiment and hope for
the best.
D. The scientist should change the hypothesis to take the
contamination into consideration,

A. The scientist should restart the experiment at a step prior to

contamination.

Explanation:

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

the fossil record provides evidence of a common ancestor to many species.