| A | B |
|---|
| vertebrate | animals with a backbone |
| invertebrate | animals without a backbone |
| endoskeleton | a system of bones inside the animal's body |
| exoskeleton | a system of bones outside the animal's body |
| chordates | phylum of animals with a nerve cord |
| examples of vertebrates | fish, mammals, birds, reptiles, amphibians |
| 96 percent | number of animals in the world that are invertebrates |
| radial | symmetry in which the body is shaped like the spokes on a wheel |
| assymetrical | symmetry in which the body has no specific shape |
| bilateral | symmetry in which each half of the body is the same |
| porifera | phylum of sponges |
| sponge | one type of animal that filters food from the water it lives in |
| spicules | rodlike structures of tough protein in the skeleton of a sponge |
| cnidarians | animals with the ability to sting with tentacles |
| medusa | a bowl shaped cnidarian |
| polyp | a vase shaped cnidarian |
| annelida | phylum of earthworms |
| flatworm | worm with a flattend body, a digestive system with one opening, and a simple nervous system |
| types of flatworms | planarian, fluke, tapeworm |
| roundworm | worm with a round, tubelike body |
| parasite | an animal that harms the host that it is feeding on |
| tapeworms and flukes | flatworm parasites |
| hookworm and pinworms | roundworm parasites |
| Trichinella | roundworm in pigs that can transfer to humans |
| segmented | worms whose bodies are made up of connected sections |
| setae | hairlike structures on the underside of earthworms that help them to move |
| hermaphrodyte | animals that have both male and female reproductive organs, like the earthworm |
| mollusk | animal with a soft body and no bones |
| mollus | Latin word meaning soft |
| examples of mollusks | clams, oysters, slugs, snails, squid, octopods |
| squid | mollusk with an inside shell |
| octopod | mollusk with no shell |
| mantle | organ in mollusks that forms the shell or touch outer covering |
| bivalve | molllusks with two connected shells and one muscular foot |
| molting | the process of a mollusk losing its old shell and growing a new one |
| filter feeders | bivalves filter food out of the water |
| clams and oysters | examples of bivalves |
| cephalopods | squid and octopod |
| gastropods | snails |
| radula | saw like tongue of the snail used for cutting food |
| arthropod | animals that have jointed exoskeletons |
| example of crustaceans | lobsters |
| examples of arachnids | spiders, ticks, scorpions |
| examples of insects | crickets and grasshoppers |
| animals with six jointed legs | insects |
| animals with eight legs and no antennae | arachnids |
| animals with claws around the head and antennae | crustaceans |
| echinoderms | invertebrates with internal skeletons and spines sticking out from their bodies |
| examples of echinoderms | starfish and sea urchin |
| tube feet | unusual adaptation of echinoderms |
