| A | B |
|---|
| CHORDATE | The phylum whose members have a notochord, a nerve chord, and slits in their throat area at some point in their lives |
| NOTOCHORD | A flexible rod that supports a chordate’s back |
| CARTILAGE | A connective tissue that is more flexible than bone and that gives support to some parts of the body |
| VERTEBRA | The bones that make up the backbone of an animal |
| 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 |
| FOSSIL | The preserved remains or traces of an organism that lived in the past |
| SEDIMENTARY ROCK | A type of rock that forms when particles form other rocks or the remains of plants and animals are pressed and cemented together |
| FISH | A vertebrate that lives in water and has fins |
| SWIM BLADDER | An internal gas-filled organ that helps a bony fish stabilize its body at different water depths |
| BUOYANT FORCE | The force that water exerts upward on any underwater object |
| AMPHIBIAN | An ectothermic vertebrate that spends its early life in water and its adulthood on land, returning to water to reproduce |
| ATRIUM | Each of the two upper chambers of the heart that receives blood that comes into the heart |
| VENTRICLE | A lower chamber of the heart that pumps blood out to the lungs and body |
| HABITAT | The place where an organism lives and that provides the things the organism needs |
| REPTILE | An ectothermic vertebrate with lungs and scaly skin; lays eggs with tough, leathery shells |
| URINE | A watery fluid produced by the kidneys that contains urea and other waste materials |
