Differential reproduction of genotypes leads to evolution via what process? inbreeding natural selection genetic rescue genetic drift mutational load

"natural selection"

Natural selection is the phenotype selection that occurs naturally from the sexual reproduction and survival factors. There is variation in all populations of organisms leading to a wide range of genotypes, and consequently, phenotypes. This variation is where natural selection will act upon.

The higher you go up the less oxygen there is 

Lipid because of the high percentage of carbon to carbon bonds, which store more energy than other bonds.