1. What feature of the saber-toothed tigers gave them their name? whiskers upper teeth lower teeth claws

2. Pterodactyls were ancestors of today's birds. True False

3. What early mammal is an extinct elephant? urus megathere dimetrodon mammoth

4. The earliest ancestor of the horse was no bigger than a fox. True False

5. Where did the earliest animals live? underground in the sea in trees on the seashore