Environmental scientists want to conduct DNA surveillance. Which statement best describes how they can use a control sample that is known to
be from a specific species?
A. As a tool to produce multiple banding patterns in the gel
O B. As a positive control to show whether the species is present in the
area
C. As a tool to amplify the strands of all the collected DNA
D. As a negative control to show whether the species is present in
the area

it is either c or d and i know for sure it is not a or b

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.

the answer is 100% density i've answered this question before and done the quiz myself.