66. The earliest ancestor of horse from early Eocene period is a.eohippus b.miobibbus c.pliohippus d.merychippus
Correct option is B) Horses appeared during the early Eocene period, it was a hoofed mammal with browsing habit, known as Hyracotherium, popularly called the 'Eohippus' So, the correct answer is 'Eohippus'.
