Research indicates that a person infected with the flu virus can have a hundred trillion virus particles within his or her body after a few days. Some scientists argue that a virus is alive based on this information. Which characteristic of living things can the scientists use to make this argument? • All living things are made of cells.
• All living things undergo respiration.
• All living things reproduce.
• All living things move. ​

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.

c. heat from the poles back down towards the equator.