| A | B |
|---|
| Vertebrate | an animal's backbone |
| Invertebrate | animal's that lack a backbone, about 97% of all animals belong to this group |
| Chordata | The only phylum in the animal kingdom whose organisms have backbones. |
| Mollusks | Snails, oysters, clams, slugs, octopus, and squid are members of this phylum in the animal kingdom. |
| Segmented worms | The common earthworm is an example of this phylum of worms. Their bodies have many different "little rings". |
| Annelid | The Latin name of segmented worms, it literally means "little rings". |
| Setae | Bristle-like hairs on an earthworm that help it move. |
| Leeches | A type of segmented worm that sucks blood and latches onto animals and humans. It secretes a numbing chemical and a blood-anti-coagulation chemical when it latches onto something. |
| Metamorphosis | Incomplete or Complete, it is the transformation process through which insects and other arthropods develop into adults. |
| Pupa | Third stage of complete metamorphosis, it is when the larva goes into hiding. It is the cocoon stage in butterflies. |
| Arthropods | A phylum of the animal kingdom whose members have exoskeletons, jointed appendages, and multiple body segments. |
| Crustaceans | A class of arthropods that includes lobsters, crabs, and shrimp. |
| Arachnids | A class of arthropods that has 8 legs and two body parts. Spiders, ticks, and scorpions are all examples. |
| Insects | This class of arthropods has 6 legs and three body parts; head, thorax, abdomen. |
| Thorax | The middle of three insect sections, it is where all 6 legs extend from. |
| Exoskeleton | The outer shell of an arthropod, it is shed during molting because it does not grow with the animal like our bones do. |
| Molting | The process through which arthropods shed their exoskeletons and grow new ones. |
| Appendage | An extension from the body of an organism. Examples include arms, legs and attenae. |
| Spiracle | The opening in arthropods that takes in air and expels waste gases. |
| Larva | Second or "baby" stage of complete metamorphosis. |
| Complete Metamorphosis | Metamorphosis that has 4 stages; egg, larva, pupa, adult. |
| Incomplete Metamorphosis | Metamorphosis that has 3 stages; egg, nymph, adult. |
| Nymph | The second stage of Incomplete Metamorphosis. |
| Pupa | The third stage of Complete Metamorphosis. |
| Cephalopods | The most advanced group of Mollusks, these move by jet-like propulsion and include squid and octopus. |
| Gastropods/Univalves | Mollusks with 1 shell like snails and conchs OR slugs. |
| Bivalves | Mollusks with two shells, like scallops, mussels, oysters, and clams. |
| Echinoderms | Greek for "spiny skinned", this phylum of invertebrates typically has a water vascular system and includes species such as sea urchins, starfish, and sand dollars. They mostly have radial symmetry. |
| Tube Feet | Hollow thin-walled tubes that each end in a suction cup. |
| Water-Vascular System | A network/system of water-filled cnals with thousands of tube feet connected to it. |
| Mantle | Covers the body organs of mullusks. This also secretes the shells of univalves and bivalves. |
| Radula | Gastropods use this tongue-like organ with rows of teeth - to obtain food. |
