mariesavannah77 mariesavannah77

25-04-2018
Physics

contestada

Which causes the production of vitamin D in humans?

A. ultraviolet rays
B. radio waves
C. gamma rays
D. X-rays

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cupcake225 cupcake225

25-04-2018

B radio waves is the answer

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gardenslumber gardenslumber

25-04-2018

it's A because there used for tanning

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