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Organisms
| Term | Definition |
|---|---|
| homeostasis | The condition in which an organism's internal environment is kept stable in spite of changes in the external environment |
| adaption | An inherited behavior that one animal uses to gain control over another animal |
| vertebrate | An animal with a back bone |
| invertebrate | An animal without a backbone |
| tissue | A group of similar cells that perform a specific function |
| organ | A body structure that is composed of different kinds of tissue that work together |
| radial symmetry | A body plan in which any number of imaginary lines that all pass through a central point divides the animal into two mirror images |
| bilateral symmetry | A body plan in which a single imaginary line divides the body into left and right sides that are mirror images of each other |
| cnidarian | A radially symmetrical invertebrate that uses stinging cells to capture food and defend itself |
| mollusk | An invertebrate with a soft, unsegmented body; most are protected by a hard outer shell |
| arthropod | An invertebrate that has an external skeleton, a segmented body, and jointed appendages |
| exoskeleton | External skeleton; a tough, waterproof outer covering that protects, supports, and helps prevent evaporation of water from the body of many invertebrates |
| echinoderm | A radially symmetrical marine invertebrate that has an internal skeleton and a system of fluid filled tubes |
| endoskeleton | An internal skeleton; structural support system within the body of an animal |
| chordate | An animal that has a notochord, a nerve cord, and throat pouches at some point in its life |
| notochord | A flexible rod that supports a chordate's back just below the nerve cord |
| vertebrae | the bones that make up the backbone of an organism. In humans, one of the 26 bones that make up the backbone |
| ectotherm | An animal whose body temperature is determined by the temperature of its enviroment |
| endotherm | An animal whose body temperature is regulated by the internal heat the animal produces |
| fish | A vertebrate whose body temperature is determined by the temperature of its environment, and that lives in the water and has fins |
| cartilage | A connective tissue that is more flexible than bone an that protects the ends of bones and keeps them from rubbing together |
| amphibian | a vertebrate whose body temperature is determined by the temperature of its environment, and that lives in water and its adult life on land |
| reptile | A vertebrate whose temperature is determined by the temperature of its environment, that has lungs and scaly skin, and that lays eggs on land |
| bird | A vertebrate whose body temperature is regulated by its internal heat, lays eggs, and has feathers and a four-chambered heart |
| mammal | |
| mammary gland | |
| monotreme | |
| marsupial | |
| placental mammal | |
| plancenta |
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