| A | B |
|---|
| open circulatory system | blood is NOT inside vessels |
| closed circulatory system | blood IS inside vessels |
| skeletal system | system that makes red blood cells |
| digestive system | system used to break food down small enough to get inside a cell |
| circulatory system | system that transports nutrients and oxygen |
| cnidarian | organisms with stinging cells |
| mollusk | soft bodied animals, sometimes with shells |
| exoskeleton | outer covering or shell |
| arachnid | spiders are examples |
| molting | shedding an outer shell |
