Expert Verifed Ace the Test
Eocene Epoch - ANSWER ✔✔55-34 mya; low sea levels created
land bridges
Hyracotherium and Orohippus
Hyracotherium (Eohippus) - ANSWER ✔✔The ancient horse,
ancestor of the modern horse, Equus; teeth resembled primates
Orohippus - ANSWER ✔✔Mountain horse;
Oligocene Epoch - ANSWER ✔✔34-23 mya; the great divide; colder
climate; horses disappeared in Europe
, Mesohippus - ANSWER ✔✔An ancestor of the horse that had three
toes, flat teeth for grazing, and was larger in size than Hyracotherium.
Miocene - ANSWER ✔✔23-5 mya; increased dryness and expanded
vegetation
Merychippus - ANSWER ✔✔An ancestor of the horse, characterized
by its larger size, teeth for grazing (hypsodont), and hooves with two
vestigial toes.
Pliohippus - ANSWER ✔✔gave rise to hippidion genera; formed
Dinohippus
Pliocene - ANSWER ✔✔5.3-2.6 mya; tectonic activities
Pleistocene - ANSWER ✔✔ice age; glaciations
Dinohippus - ANSWER ✔✔Closest relative to Equus
13-5 mya
Equus - ANSWER ✔✔molecular evidence divides extant Equus into
stenoids and callaboids
Kazakhstan - ANSWER ✔✔where it is thought that horses were
domesticated
1915-1920 - ANSWER ✔✔Horse/Mule population peak