the more melanin, the darker the skin color

the epidermis produces vitamin C

a bruise forms from broken blood vessels under unbroken skin

the sweat glands remove water and sugar from the body

the PNS includes the brain

your olfactory cells help you smell

taste buds respond to chemicals dissolved in water

caffeine is a stimulant

the CNS includes the brain and nreves

the brain is the largest organ in the body

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