| A | B |
|---|
| ventral | belly surface of an organism |
| nematodes | phylum of round worms |
| thorax | one body segment of insects |
| molting | sheading and growing and exoskeleton(insects) |
| not ochord | spinall chord like structure in vertebrates |
| invertebrate | animals without vertebrae (backbone) |
| homologous structures | similar parts on different organisms |
| mammary glands | milk glands on mammals |
| diaphram | sheet of muscle for breathing in mammals |
| platypus | primitive mammal that lays eggs in a nest |
| marsupial | primitive mammal that carries young in a marsupium (pouch) |
