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Chapter 3

Notochord A flexible rod that supports a chordate's back.
Ectotherm An animal whose body does not produce much internal heat.
Cartilage A flexible, strong tissue that is softer than bone.
Endotherm An animal who body controls and regulates its temperature by controlling the internal heat it produces.
Chordate The phylum who members have a notochord, a nerver cord, and slits in their throat area at some point in their lives.
Vertebra The bones that make up the backbone of an animal.
Fish An ectothermic vertebrate that lives in the water and has fins.
Swim Bladder An internal gas-filled organ that helps a bony fish stabilize its body at different water depths.
Bouyant Force The force that water exerts upward on any underwater object.
Amphibian An ecothermic vertebrate that spends its early life in water and its adulthood on land returning to water to reproduce.
Habitat The specific environment in which an animal lives.
Atrium An upper chamber of the heart.
Ventricle The lower chamber of the heart, which pumps blood out to the lungs and blody.
Reptile An exothermic vertebrate that has lung and scaly skin.
Urine The watery fluid in which the wastes produced by an animal's cells are exerted.
Fossil The hardened remains or other evidece of a living thing that existed a log time in the past.
Seddimentary Rock Rock formed from hardened lauers of sediments- particles of clay, sand, mud, and slit.
Paleontologist A scientist whop studies extinct organisms, examines fossil structure and makes comparrison to present day organisms.
Created by: AshleighKibbons