| A | B |
|---|
| habitat | The specific environment in which an animal lives. |
| carnivore | An animal that eats only other animals. |
| herbivore | An animal that eats only plants. |
| ectotherm | An animal whose body does not produce much internal heat. |
| endotherm | An animal whose body controls and regulates its temperature by controlling the internal heat it produces. |
| cell | The basic unit of structure and function in living things. |
| chlorophyll | A green pigment found in the chloroplasts of plants,algae, and some bacteria. |
| fossil | The hardened remains or other evidence of a living thing that existed a long time ago. |
| nucleus | A cell structure that contains nucleic acids, the chemical instructions that direct all the cell's activities. |
| gene | A segment of DNA on a chromosome that codes for a specific trait. |
| hetertroph | An organism that cannot make its own food. |
| autotroph | An organism that makes its own food. |
| DNA | Deoxyribonucleic acid |
| chordate | The phylum whose members have a notochord, a nerve cord, and slits in their throat area at some point, |
| urine | The watery fluid in which the wastes produced by an animal 's cells are excreted. |
| cartilage | A flexible, strong tissue that is softer than bone. |
| invertebrate | An animal that does not have a bockbone. |
| 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. |
| amphibian | An ectothermic vertebrate that spends its early life in water and its adulthood on land. |
| reptile | An exothermic vertebrate that has lungs and scaly skin. |
| vertebrate | An animal that has a backbone. |
| species | A group of organisms that can mate with each other and produce offspring which can also mate and reproduce. |
| response | An organism's reaction to a stimulus. |
| radial symmetry | The quality of having many lines of symmetry that all pass through a central point. |
