| A | B |
|---|
| Radula | Mollusk toungue structure for rapsing |
| Nephridia | Excretory structure in the Annelids |
| Open circulatory system | Blood is NOT always in a vessel or vein |
| Closed circulatory system | blood is ALWAYS in a vessel |
| Water vascular system | Echinoderm system that is responsible for movement and circulation |
| Radial Symmetry | Having many midlines |
| Bilateral Symmetry | Having only one midline |
| Setae | Bristles on the segments of an annelid |
| Tube feet | The extentions of the Water Vascular System |
| Tracheal tubes | Insect breathing tubes |
| Book lungs | Spider breathing structure |
| Incomplete metamorphosis | growing from small to large through successive molts |
| Complete metamorphosis | catepillar changing in a cocoon |
| Molting | losing the exoskeleton so that the arthropod can grow |
| Hermaphrodites | having both male and female reproductive structures - and the both work! |
| Exoskeleton | Support structures on the outside that must be shed in order for the organism to grow |
| Malpighian tubules | Insect excretory structures |
