Amino acids are the building blocks of proteins and are made from basic amino group (−NH2) and an acidic carboxyl group (−COOH) as well an organic R group (or side chain) that is unique to each amino acid. they are made from carbon, hydrogen, oxygen and nitrogen atoms
I pretty sure it is because the earth is bigger than the moon
common descent means the evolutionary in biology and how they have something linked with their common ancestors.
A. Your leg jumping when it is hit by a reflex hammer
