| A | B |
|---|
| apendages | structures that grow out of a body |
| arthropods | invertebates with jointed legs |
| echinoderms | spiny-skinned invertebrates that live on the ocean bottom |
| invertebrate | animal without a backbone |
| medusa | body plan that is bell-shaped |
| metamorphosis | change in form some animals go through as they develop and mature |
| mollusks | soft bodied invertebrates that usually have shells |
| polyp | body plan that is shaped like a tube or vase |
| radial symmetry | body parts arranged around a central point |
| bilateral symmetry | an animal that has identical body parts on both sides of its body |
| what covers a sponge | small openings called pores |
| how many legs on an arachnid | eight |
| how did early scientists classify sponges | as plants |
| segmented worms have what kind of digestive system (likew mollusks) | complete digestive systems |
| what is an open circulatory system and how does it work | blood not contained in blood vessels, spread over the organs |
| how are bivalves different from other mollusks | they have two shells |
| what causes heart worms in dogs | roundworms |
| many mollusks have a tonguelike organ that works like a file, what is that | radula |
| what do all cnidarians have | radial symmetry |
| What do water-dwelling mollusks have in the mantle cavity | gills |
| how are mollusks classified | according to their foot, if they have a shell and what kind of shell it is |
| What is the largest group of complex invertebrates | insects |
| earthworms and cephalopods have blood that isin vessels, what name this system | closed circulatory system |
| what are spicules and what organism has them | they are sharp structures in the bodies of sponges |
| how do sponges reproduce | both sexually and asexually |
| segmented worms have bristlelike structures called what and what do they help them do | setae and help them move |
| flatworms and roundworms have what kind of symmetry | bilateral |
| what does a water_valsular system allow echinoderms to do | move, eat, get oxygen and get rid of wastes |
| what do all arthropods have | jointed legs |
| polyps forms of cnidarians can repoduce how | by budding |
