Why is preserving the biodiversity of the earth important

Ecosystems serve humans because they provide natural functions. For example, the microbes in an ecosystem are vital in the breakdown of dead plant and animal remains and in the recycling of nutrients. Biodiversity provides actual and potential material and economic benefits to people.

Explanation:

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.