| A | B |
|---|
| baleen | the bony plates that function to filter food from water in some whales |
| bicuspid | a tooth with two points used to shred food |
| canine | a pointed tooth used to grip and tear |
| cecum | a blind sac usually found in the digestive sustem |
| diaphragm | a thoracic cavity muscle used in breathing |
| echolocation | a method of navigation similar to sonar in which the sound produced bounces off an object |
| gestation period | length of pregnancy |
| incisor | the chisellike tooth used for biting and cutting |
| mammary gland | one of the milk-secreting glands of mammals |
| molar | a flattenned tooth used to grind and crush |
| omnivore | an animal that eats both plants and animals |
| placenta | the organ that nourishes the unborn young of placental mammals |
| rumen | the storage chamber in the stomach of artiodactyls |
| therapsid | the reptile group from which mammals evolved |
| ungulate | a hoofed mammal |
| viviparous | referring to organisms that carry and nourish the young inside the body before birth |
