| A | B |
|---|
| This was a burst of animal diversity that occurred about 550 mya | Cambrian Explosion |
| All invertebrates have some type of body symmetry except for the | Sponge |
| Bilateral symmetry | enables the concentration of sense organs and nerve cells in the front of the body |
| A vertebrate is any chordate that has a | backbone |
| The first vertebrates to evolve were | Fishes |
| An example of a jawless fish is a | lamprey |
| Thw sponges are the only group of animals that due not have true | tissues |
| A hypothesis of animal orgin is that animals evolved from ___ that lived as colonies of cells | Protists |
| Early vertebrates developed ___ which expanded their range of food sources | hinged jaws |
| Animals that have bodies that can maintain a constant internal temperature are | Endothermic |
| Animals whose body temperatures change with their environment are | Ectothermic |
| The ___ system in a shark enables it to detect pressure vibrations | Lateral Line |
| Animals have a ___ food-getting pattern | Heterotrophic |
| Animals have a _____ body structure | Multicellular |
| Animals all have ___ cells (those with a nucleus) | Eukaryotic |
| Sharks, unlike whales have ___ so that they can obtain oxygen from the water | gills |
| This group of animals has a heart with two atria and two ventricles | Mammals |
| The appendages of an arthropod allow for a variety of | Movements |
| Female crayfish have a crescent shaped slit on their ___ surface | ventral |
| structural support located inside an animal's body is called an | endoskeleton |
| This hard body covering is made up of chitin | exoskeleton |
| An organism with ___ can be divided into equal halves by drawing any number of lines through its center | radial symmetry |
