Assertion : The earliest fossil form in the phylogeny of horse is eohippus. Reason : Eohippus lived during the early pliocene epoch.

Step-by-step solution

The evolution of horses could be erroneously depicted as an undeviating straight line progression from the small, terriero (small dog of various breeds) sized Hydracotherium eohippus to the large modem horse, Equus eohippus originated from Eocene period. Eohippus (meaning "dawn horse") was the earliestknown horse. It was the size of a tiny dog. Another name for this genus is Hyracotherium (meaning "mole beast"). Eohippus was only 2 feet ((60 ~cm ) ) long and 8 to 9 inches ((20 ~cm ) ) high at the shoulder. This pri