The brain 7 Organ systems work together to meet the needs of the human body. How is the
skeletal system related to the nervous system?
F. The skeleton protects the brain and spinal cord.
G The brain determines how the skeleton develops.
H The brain and spinal cord hold the skeleton together.
I The skeletal system works as a part of the nervous system.

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explanation:

i think its the first one

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.

there's the proffessional site that will you.