| A | B |
|---|
| species | A group of organisms that can mate with each other and produce offspring which can also mate and reproduce. |
| autotroph | An organism that can make its own food. |
| fertilization | The joining of egg and sperm. |
| adaptation | A characteristic that helps an organism survive in its environment or reproduce. |
| carnivore | An animal that eats only other animals. |
| prey | An animal that a predator feeds upon. |
| phylum | One of about 35 major groups into which biologists classify members of the animal kingdom. |
| vertebrate | An animal that has a backbone. |
| heterotroph | An organism that cannot make food for itself, and must obtain food by eating other organisms. |
| sexual reproduction | The process by which a new organism forms from the joining of two sex cells. |
| asexual reproduction | The process by which a single organism produces a new organism identical to itself. |
| herbivore | An animal that eats only plants. |
| predator | A carnivore that hunts and kills other animals and has adaptations that help it capture the animals it preys upon. |
| omnivore | An animal that eats both plants and animals. |
| invertebrate | An animal that does not have a backbone. |
| bilateral symmetry | Line symmetry; the quality of being divisible into two halves that are mirror images. |
| radial symmetry | The quality of having many lines of symmetry that all pass through a central point. |
| larva | The immature form of an animal that looks very different from the adult. |
| cnidarian | Animals whose stinging cells are used to capture their prey and defend themselves, and who take their food into a hollow central cavity. |
| polyp | The cnidarian body plan characterized by a vaselike shape and which is usually adapted for life attached to an underwater surface. |
| medusa | The cnidarian body plan characterized by a bowl shape and which is adapted for a free-swimming life. |
| regeneration | The ability of an organism to regrow body parts. |
| parasite | An organism that lives inside or on another organism and takes food from the organism in or on which it lives. |
| host | An organism that provides food to a parasite that lives on or inside it. |
| anus | The opening at the end of an organism's digestive system through which wastes exit. |
