5. how does the location of the nodules relate to the function of the nodule? explain.

These nodules are mostly found in the roots of legumes. They encapsulate and shelter nitrogen-fixing bacteria (Rhizobium) in a symbiotic relationship. These nitrogen-fixing bacteria fix atmospheric nitrogen into ammonia that is available for absorption by the plants. The legumes have developed a mechanism to attract the bacteria using flavonoid signals.

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.