| A | B |
|---|
| monotreme | egg laying mammals |
| vertebrate | animals with backbone |
| invertebrate | animals without backbones |
| gestation | time between fertilization and birth |
| placental mammal | develops in mother's body until it can function independently |
| placenta | an organ in pregnant mammals that passes materials between the mother and embryo |
| ectotherm | cold blooded |
| endotherm | warm blooded |
| chordate | phylum with notochord, nerve chord and slits in throat area |
| incisors | teeth that bite or cut food |
| canines | pointed teeth that stab and tear food |
| molars | broad, flat teeth for grinding and shredding |
| carnivore | meat eating animal |
| omnivore | animal that eats plants and meat |
| herbivore | plant eating mammals |
| diaphragm | breathing organ |
| fur or hair helps mammals | keep their internal temperature stable |
| bats use this sense to capture insects | hearing |
| three main groups of mammals | monotremes, marsupials. placental mammals |
| four main groups of arthropods | crustaceans, arachnids, insects, centipedes and millipedes |
