Ref: online search (Changes to short stretches of nucleotides are called gene-level mutations, because these mutations affect the specific genes that provide instructions for various functional molecules, including proteins. Changes in these molecules can have an impact on any number of an organism's physical characteristics.)
Oxygen. I got this answer because the process of Oxidation is when oxygen bonds with an element. Such as Iron Oxide, which is rust. So oxygen does, infact, have more of a role in chemical weathering.
The number of protons in an atomic nucleus; it indicates the position of an element in the periodic table. The number of protons in the nucleus of an atom. Inelectrically neutral<span> atoms, this number is also equal to the number of electrons orbiting about the atom's nucleus.
hoped it helped!!</span>
