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flash cards

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 chordates back.
CARTILAGE A flexible,strong tissue that is softer than bone.
VERTEBRAE The bones that make up the backbone of an animal.
ENDOTHERM An animal whose body controls and regulates its temperatures by controlling the internal heat it produces.
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.
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 adult hood on land,returning to water to reproduce.
atria the two upper chambers of the heart that receives blood.
ventricle the lower chamber of the heart,which pumps blood to the lungs and body.
reptile an exothermic vertebrate that has lungs and scaly skin.
habitat the specific environment in which an animal lives.
urine the watery fluid in which the wastes produced by an animals cells are excreted.
sedimentary rock rock formed from hardened layers of sediments particles of clay,sand,mud,or slit.
fossil the hardened remains or other evidence of a living thing that existed a long time in the past.
paleontologists a scientist who studies extinct organisms,examines fossil structure,and makes comparisons to present-day organisms.