| A | B |
|---|
| Agnatha | jawless fish; lamprey |
| Amphibian | animals that need water for reproduction and to help in respiration; frogs |
| Amphioxus | animal that has all of the chordate characteristics as an adult |
| Arthropoda | means joint-footed animals |
| Aves | animals with feathers |
| Carapace | portion of exoskeleton which covers the cephalothorax |
| Cephalothorax | head and chest (thorax) fused; spiders and crayfish |
| Chondrichythes | fish with a cartilage skeleton; shark |
| Cleavage | cell division that reduces the size of the egg cell; first divisions of the fertilized egg |
| Complete | type of metamorphosis in which a egg hatches into larva which pupates to form adult |
| Deuterostome | refers to the blastopore becoming the anus |
| Dioecious | separate sexes |
| Echinodermata | spiny skinned animals |
| Ectothermic | type of animal that uses the environment to control their temperature |
| Endoskeleton | supporting structure inside the body |
| Endothermic | type of animal that produces and maintains its body temperature independent of the environment |
| Exoskeleton | hard outer covering secreted by the epidermis; external (outside) support structure |
| Feathers | structure unique to birds |
| Gills | respiratory structures in aquatic animals |
| Green | excretory gland of crayfish |
| Incomplete | type of metamorphosis in which the young are similar in appearance to the adults |
| Malphigian tubules | excretory organs of insects |
| Mammal | fur bearing animal that nurses its young |
| Metamorphosis | animal has different body forms throughout its life cycle |
| Notochord | support rod found at some time in the life of all chordates |
| Osteichthyes | bony fish |
| Protostome | first mouth |
| Reptile | animal with dry scales |
| Tube feet | part of the water vascular system of echinoderms; work like suction cups for moving and eating |
| Vertebrates | chordates that have a backbone |
| Molting | shedding of exoskeleton so animal can grow |
| Mandibles | jaws; crush food |
| Maxillae | appendages in a crayfish that handle food |
| Gastric mill | teeth |
| Ventral | belly side |
| Insects | three body regions; six legs |
| Regeneration | ability to regrow lost parts |
| Blastula | hollow sphere (ball) |
