What occurs when multicellular organisms (Humans) grow and develop? A. cell increase in numbers
B. Individual cells grow larger
C. Cells decrease in size
D. Cells decrease in numbers

A. cell increase in numbers

Explanation:

One of the differences between unicellular and multicellular organisms is that by dividing cells, unicellular organisms multiply and multicellular organisms grow. As a multicellular organism grows, the number of its cells increases.

By growth, we mean an increase in the number of cells and an increase in the whole organism. Development refers to the changes that that organism goes through.

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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.