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Stack #124860

chpt 12 sec 1&2

notochord a flexible rod that supports the animal's back
cartilage a connective tissue that is softer than bones, but flexible and strong.
vertebrae similar bones lined up in a row, like beads on a string
endoskeleton internal skeleton
ectotherm an animal whose body does not produce much internal heat -- its body temperature changes depending upon the temperature of its environment
endotherm an animal whose body controls and regulates its temperature by controlling the internal heat it produces
fossil the hardened remains or other evidence of a living thing that existed a long time in the past
sedimentary rock made of hardened layers of sediments, particles of clay, sand, mud, or silt.
fish a vertebrate that lives in the water and has fins, which are structures used for moving.
jawless fishes skeleton made of cartiloage and do not have fins and mouths do not have jaws. their mouths have structures for scraping, stabbing, and sucking.
catilaginous fishes skeleton made of cartilage, have jaws and pairs of fins, pointed, toothlike scales voer their bodies, carnivores
bony fishes have skeletons made of hard bone, body coved with scales and gills
swim bladder an internal gas-filled sac that helps the fish stabilize its body at different depths
buoyant force the force that water exerts upward on any underwater object
Created by: analopez