Fact 1: Gravity causes objects that have mass to be pulled down on a planet. Fact 2: Gravity was defined by Newton. Given the two facts above, the thing that causes objects to be pulled down on a planet was defined by which scientist?

Pick from:
(A). friction
(B). Darwin
(C). kinetic
(D). the sun
(E). Galileo
(F). Kepler
(G). energy
(H). Newton
The answer is:
(H).