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Predict the physical state of ammonia at -15 °C (Mp = -77 °C,Bp = -33 °C) and normal atmospheric pressure.
Melanocytes
Cells located in the skin that produce melanin, the pigment responsible for the skin's color and protection against UV radiation.
Keratinocytes
Cells that make up the majority of the epidermis, producing keratin to help form a protective barrier for the skin.
Melanin
A pigment found in the skin, hair, and eyes that gives them color and offers protection against ultraviolet radiation.
Arrector Pili
Small muscles attached to hair follicles in mammals, contraction of which causes the hair to stand upright, producing goosebumps.
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