While dams are useful to the human population in an area, what the most likely negative impact of the dam on the local environment?

It will probably stop fish migration

Explanation:

Fish have to migrate so they don't die from the cold or starvation. They swim upstream and eventually reach there destinations. If a dam is in the way it will cause the fish to have a block in there path and they will eventually die

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.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex