Paleontologists have discovered several ancestors of the modern horse.

Based on the skeleton, the skull, and the leg bones, which fossil is the oldest?

Which fossil is most like a modern horse?

Carbon dioxide is the correct answer

A  reaction  in which  energy  is  released  to the surroundings is called an exothermic  reaction. in this type of  reaction  the enthalpy, or stored  chemical energy, is lower for the products than the reactants. when ammonium nitrate is dissolved in water,  energyis  absorbed  and the water cools.