The description of a cell organelle is given below.
• acts as the control center.
• give directions to make proteins.
• contains genetic material
what organelle is being described?
a) the nucleus
b) the chloroplast
c)the endoplasmic reticulum
d) the mitochondria

A) the nucleus

Explanation:

The nucleus is in the middle of the cell. And it controls everything and gives directions to help other organelles.

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explanation:

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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.