Jackson-SC-Ch16&17
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| vertebrate | an animal that has a backbone
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| endotherm | an animal that can use body heat from chemical reactions in the body's cells to maintain a constant body temperature
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| ectotherm | an organism that needs sources of heat outside of itself
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| lateral line | a faint line visible on both sides of a fish’s body that runs the length of the body and marks the location of sense organs that detect vibrations in water
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| gill | a respiratory organ in which oxygen from the water is exchanged with carbon dioxide from the blood
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| swim bladder | in bony fishes, a gas-filled sac that is used to control buoyancy; also known as a gas bladder
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| lung | a respiratory organ in which oxygen from the air is exchanged with carbon dioxide from the blood
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| tadpole | the aquatic, fish-shaped larva of a frog or toad
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| amniotic egg | a type of egg that is surrounded by a membrane, the amnion, and that in reptiles, birds, and egg-laying mammals contains a large amount of yolk and is surrounded by a shell
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| preening | in birds, the act of grooming and maintaining their feathers
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| molting | the shedding of an exoskeleton, skin, feathers, or hair to be replaced by new parts
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| down feather | a soft feather that covers the body of young birds and provides insulation to adult birds
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| contour feather | one of the most external feathers that cover a bird and that help determine its shape
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| brooding | to sit on and cover eggs to keep them warm until they hatch; to incubate
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| mammary gland | in a female mammal, a gland that secretes milk
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| diaphragm | a dome-shaped muscle that is attached to the lower ribs and that functions as the main muscle in respiration
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| placental mammal | a mammal that nourishes its unborn offspring through a placenta inside its uterus
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| gestation period | in mammals, the length of time between fertilization and birth
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| monotreme | a mammal that lays eggs
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| marsupial | a mammal that carries and nourishes its young in a pouch
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tlindstrom
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