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Unit 2 Review

Definitions:
nearsighted short answer questions , hair follicle, decibel, iris, optic nerve, gingivitis, plaque, orthodontia, sebum, fluoride, corneaweb page, SPF, pupil, astigmatism, ultraviolet rays, auditory nerve, farsighted, oil gland,

Answers:
oil released by the oil (sebacious) gland, able to see things nearby, but far away things are blurry, gum disease, substance composed mostly of bacteria that builds up on teeth , invisible energy waves given off by the sun, straightening crooked teeth, where light enters the eye , clear covering that protects the eye, carries messages from the eye to the brain, sun protection factor, a mineral that can help protect teeth, controls that amount of light that enters the eye, a unit used to measure the loudness of sound, able to see things far away, but things nearby are blurry, blurry vision caused by an unevenly curved cornea or lens, the part of the skin that contains the root of a hair, gland that releases sebum and opens into a hair follicle , carries signals to the brain to be interpreted as sound,