How might a homogeneous gene pool make the endangered cheetah more susceptible to extinction?
diseases for which cheetahs have low resistance could kill several cubs within a short period.
a homogeneous gene pool makes the population stronger, so there is no danger of extinction.
predators prefer to prey on cheetahs that are genetically similar so they are more susceptible to extinction.
a homogeneous gene pool only makes cheetahs look similar to each other and cannot make them susceptible to extinction.

Diseases for which cheetahs have low resistance could kill several cubs within a short period.

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.