<span>The closet hominin to a current day human is: </span>Homo Sapiens.
Active site
A reactant
binds to an enzyme in a region known as the active site during a reaction. The active site is the
most important part of the enzyme because it is where the chemical reaction
happens. It usually contains three to four amino acids and a binding site that
binds the substrate and prepares it for catalysis.
I hope this diagram helps
12 or 13 mostly 12 though
They all have a rocky surface