Which of these is a benefit of scientists using models to learn about body systems? a. scientists can use model organism without worrying about controversy. b. scientists can use model systems to predict when a person is going to fall ill. c. scientists can use model systems to analyze why some animals go extinct. d. scientists can use model organisms to understand disease in many different organisms.

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.

allowed for the prediction of the properties of missing elements.