Tapeworms attach to the intestinal wall of sheep and absorb nutrients from the sheep's intestines. Which of the following best describes the relationship between tapeworms and sheep? A. parasitism
B. commensalism
C. predation
D. mutalism
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It's A

Explanation:

This is parasitism! When one organism takes nutrients and other things from another, it's parasitism. In this case, the tape worm is the parasite. But we know it's a parasite because it says that it takes food that the sheep eats, and takes it for itself. If the parasite, for some reason, takes all the sheep's food, the sheep could get sick. The sheep gets nothing good out of this.

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.