Scientists discovered fossil evidence of mesohippus, an ancestor of the modern horse. mesohippus lived in north america about 40 million years ago. mesohippus was about two feet tall, ran on hooves with three toes, and had large, grinding teeth. it is believed that these early horses lived in the thick forests.

C)a change in their food, from trees to grass in the Great Plains

Explanation:i got it wrong but then it showed the right answer i picked a before buts actually c

i think its through the fallopian tube

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands