Over time plants and animals have developed defenses against being eaten. What are some examples of these defense mechanisms? The thorns on a rose bush
The white coat of a snowshoe hare
The speed of a gazelle
The stripes of a tiger

this is a good question! i'll do some research and come back when i have the answer!

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.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.