| A | B |
|---|
| mollusks | a soft-bodied invertibrate usualy has a shell |
| mantle | in a molluscks the outside covering of the soft body |
| gills | in the water-dwelling creatures a breathing organ that extracts oxygen from the water |
| open circulatory system | open blood not all in vessels |
| radula | in molluscks a tongue-like organ with rows of teeth that scrape and tear food |
| closed circulatory system | a blood-circulation system using vessels to transport blood to the intrnational organs as in humans |
| setae | in a segment worm bristle like structure on the outside of the body that help it grip soil anf move |
| crop | in an earthworm a sac in the digestive system that stores soil eaten by the worm |
| gizzard | in a earthworm a moscular structure in the digestive system that grinds up soil |
| arthropoda | largest animal phylum |
| apendages | structures growing from the body |
| exoskeleton | on all arthopods the hard lightheight external covering that sheilds suppotrts and protects their bodies |
| molting | in animals the periodic shedding and replacing of the old body covering such as skin or an exoskeleton |
| spiracles | in an arthopod openings in the abdomen that allows oxygen and carbon dioxide to move into and out of the lungs |
