Compare the fossils of horse ancestors with the structures of a modern
horse.
5
10
10
15
15
Equus
Evolution of Horses
Hippidion
Pliohippus
Millions of years ago
30
Megahippus
20
Merychippus
25
Hypohippus
30
35
35
Mesohippus
Epihippus
40
40
45
45
50
50
55
Pachynolophus
Hyracotherium
Modern horses would have the most features in common with which
species?
A. Hyracotherium
B. Mesohippus
C. Merychippus
D. Pliohippus