| A | B |
|---|
| invertebrate, bilateral symmetry, no legs | worms |
| segments, closed circulatory system, one-way digestive track | earthworm |
| invertebrate, bilateral symmetry, soft body | mollusk |
| clams, oysters, scallops, muscles | cephalopods |
| tentacles | appendages with suckers that help cephalopods catch prey |
| Used to protect and keep an arthropod from drying out. It must be shed periodically. | exoskeleton |
| shedding of the exoskeleton | molting |
| blood is not enclosed in veins and arteries in arthropods | open circulatory system |
| a process in which an animal's body undergoes dramatic changes | metamorphosis |
| 2 body segments and 8 legs | spiders |
| 3 body segments and 6 legs | insects |
| protective coloring | camouflage |
| radial symmetry, endoskeleton, spiny skin | echinoderm |
| no backbone | invertebrate |
| an animal with a backbone | vertebrate |
| ectothermic, vertebrate, scales | fish |
| body made from cartilage | shark |
| number of chambers in an amphibians heart | 3 |
| number of chambers in a human heart | 4 |
| ectothermic, lungs, scaly skin | reptile |
| no shell and must be laid in water | amphibian egg |
| thin shell and laid on land | reptile egg |
| snakes, lizards, and crocadiles | reptiles |
