Cap and Trade is the equivelent to carbon footprint
Answer:
The small number behind each element symbol designates the number of atoms of each element in a chemical formula. If there is no number, it is assumed there is only one of those elements. A large number in front of a compound designates how many units there are of that compound.
The main determinant of skin color is melanin
Answer:
I believe this is a pacemaker. It controls the heart when it starts to fail.
Explanation: