Aresearcher observes two species of frogs in the same area. both species have a similar diet. one species breeds in fast-moving streams, while the other species breeds in ponds. both species are similar in appearance and have very similar dna. this is most likely an example of

geographical isolation.

habitat isolation.

behavioral isolation.

temporal isolation

Behavioral isolation.

Explanation:

SInce the example is saying that both species of frogs are in the same area, this eliminates the option of geographical and habitat isolation, since they are already togheter and have similar diet, appearence and DNA this means they could interbreed, and since the example is not saying anything about breeding times for each species, we can not assume this is a temporal isolation, so the only thing that sets them apart is the fact that they have different breeding rituals, since one species breeds on water ponds and the other in fast-moving streams, this is known as Behavioral Isolation, since it´s their breeding rituals that keeps them from interbreeding.

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.