| A | B |
|---|
| adaptation | a characteristic that helps an organism to survive in its environment ot to reproduce |
| anus | the opening at the end of an organism's digestive system through which wastes exit |
| bilateral symmetry | line symmetry; the quality of being divisible into two halves that are mirrior images |
| cnidarian | animals whose sting cells are used to capture their prey and ddefend themselves, and who take their food into a hollow central cavity |
| gills | a breathing organ that removes oxygen from water |
| herbivore | an animal that eats only plants |
| invertebrate | an animal that does not have a backbone |
| mollusk | an invertebrate with a soft, unsegmented body; most of them are protected by hard outer shells |
| omnivore | an animal that eats both plants and animals |
| predator | a carnivore that hunts and kills other animals for food and has adaptations that help it capture the animals it preys upon |
| prey | an animal that a predator feeds upon |
| radial symmetry | the quality of having many lines of symmetry that all pass through a central point |
| radula | a flexible ribbon of tiny teeth in mollusks |
| carnivore | an animal that eats only other animals |
| vertebrate | an animal that has a backbone |
