AP BIOLOGY

EVOLUTION

EVIDENCE FOR EVOLUTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following is true about horse evolution? (1) Early horses were about the size of a fox. (2) Early horses had toes. (3) During evolution, their molars became covered with cement
A
1 only
B
1 and 2
C
2 and 3
D
1, 2, and 3
Explanation: 

Detailed explanation-1: -The evolution of the horse, a mammal of the family Equidae, occurred over a geologic time scale of 50 million years, transforming the small, dog-sized, forest-dwelling Eohippus into the modern horse.

Detailed explanation-2: -Fossils spanning a period of more than 50 million years show how the horse evolved. The oldest horse fossils show what the earliest horses were like. They were only 0.4 m tall, or about the size of a fox, and they had four long toes.

Detailed explanation-3: -So, the correct answer is ‘All modern species have arisen from previous forms, and continue to evolve’

Detailed explanation-4: -Our resulting data indicate that more than half (55%) of natural history museums today still depict horse evolution as orthogenetic, despite the fact that paleontologists have known for a century that the actual evolutionary pattern of the Family Equidae is branching.

There is 1 question to complete.