| A | B |
|---|
| Amphibians | vertebrate animals which are ectothermic; most can breathe in water with gills as young, and breathe on land with lungs as adults; go through metamorphosis; lay jelly-like eggs. |
| Arthropods | invertebrate animals that have jointed legs, segmented bodies, and some have wings; have an exoskeleton; obtain oxygen from the air through gills or air tubes; and have bilateral symmetry. |
| Asymmetry | a body plan that has no symmetry. |
| Bilateral symmetry | a body plan that can be divided into right and left halves that are nearly identical to each other. |
| Birds | vertebrate animals which are endothermic; breathe with lungs; lay eggs; have feathers; and have a beak, two wings, and two feet. |
| Cnidarians | invertebrate animals that have specialized stinging structures in the tentacles surrounding the mouth; a central cavity for digestion; one digestive opening; and radial symmetry. |
| Echinoderms | invertebrate animals that have arms that extend from the middle body outwards (radial symmetry); tube feet that take in oxygen from the water; and spines or rough skin for protection. |
| Ectothermic | vertebrate animals whose internal temperature changes when the temperature of its environment changes. |
| Endoskeleton | an internal supportive framework of bone and/or cartilage that provides a place for muscle attachment and protects an animal’s internal organs. |
| Endothermic | vertebrate animals with a nearly constant internal temperature. |
| Exoskeleton | a thick, hard outer covering that protects and supports arthropod bodies and provides places for muscles to attach. |
| Fish | vertebrate animals which are ectothermic; obtain dissolved oxygen in water through gills; most lay eggs; have scales; have fins; and live in water. |
| Invertebrate | an animal without a backbone. |
| Mammals | vertebrate animals which are endothermic; breathe with lungs; most have babies that are born live; have fur or hair; and produce milk to feed their young. |
| Mollusks | invertebrate animals that have soft bodies; most have a thick muscular foot for movement or to open and close their shells; take in oxygen through gills or lungs, some have shells; and bilateral symmetry. |
| Radial symmetry | a body plan that is arranged in a circle around a central point, like spokes of a bicycle wheel. |
| Reptiles | vertebrate animals which are ectothermic; breathe with lungs; most lay eggs, although in some the eggs hatch inside the female; and have scales or plates. |
| Segmented worms | invertebrate animals that have long tube-like bodies that are divided into segments; a long digestive tube runs down the length its body; take in dissolved oxygen from the water through their skin; and have bilateral symmetry. |
| Sponges | invertebrate animals that have many pores (holes) through which water flows; obtain their food and eliminate wastes through this passage of water (filter-feeders); and have no symmetry (asymmetry). |
| Symmetry | the quality of being made up of similar parts facing each other or around an axis. |
| Vertebrate | an animal with a backbone. |
