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Science Chapter 3, Section 4, and Chapter 4, Section 1

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reptile
an ectothermic vertebrate that has lungs and scaly skin
urine
liquid waste that is produced in the kidneys
bird
an endothermic vertebrate with feathers and a four-chambered heart
contour feathers
large feathers that give shape to a bird's body and help with flying
down feathers
feathers that trap heat and keep a bird warm
insulator
material that helps to keep something warm