Scientists study how the brain and nerves of an animal work together. What big idea of biology does this illustrate?

All cells share common traits that help scientists draw conclusions about the basic needs and functions of living organisms.

The human and the animal brain form a part of the central nervous system. The brain of both are made up of neurons and neuroglia. Its main function is to control thoughts and body movement. The brain of all the vertebrate animals is divided into forebrain, midbrain, cerebellum, hind brain, medulla oblongata and pons.

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.