What role do restriction enzymes play in the analysis of edna? a. they sort different sized dna fragments into a banding pattern. b. they multiply small amounts of dna into larger samples. c. they purify samples of dna obtained from the environment. d. they break dna into fragments that vary in size.

the dark variety, as they are not visible on the dark tree barks

explanation:

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.