What are two ways the size of a population can increase in decrease

The size of a population increases when the number of births is greater than the number of deaths. The size of the population decreases when the number of births is less than the number of deaths.

Explanation:

The size of a population can increase or decrease due to the influence of several factors. However, in summary, we can say that the size of a population increases when the number of births is greater than the number of deaths. This can be influenced by the quality habitat, excess natural resources such as food and water, reduced number of predators, among others.

On the other hand, the size of the population decreases when the number of births is less than the number of deaths, this can occur through the unavailability of safety habitat, lack of natural resources, existence of a disease or pest, excess of predators, among others .

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.