Fossil evidence leads scientists to believe that over millions of years, Equus (horses) went from having three toes on each foot to having hooves.
What theory supports this idea? *

Okay well gravitational energy is matter forced by gravity making energy though the kinetic energy then the electric energy produces electricity from the kinetic energy and the kinetic energy gets its energy from the gravitational energy. was that the answer you wanted or something else?  

Answer two atoms of oxygen;

Precipitate, and gas

The answer is a. that is an exothermic reaction which means it produces heat