Which of these describes science and it’s limitations?
(select 2)

a. science is absolute
b. science is open to change
c. science is based on belief
d. scientists create theories based on their opinions
e. scientists conduct experiments based on testable hypotheses

I think B and E.

Explanation:

Science is open to change.

Scientists conduct experiments based on testable hypotheses.

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 relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.