I believe the answer is C. - Nucleus
(Not 100% sure)
But hope this can help! ^^
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The skin plays a role in the production of vitamin D because when dehydrocholesterol reaches the skin by means of the blood and is exposed to ultraviolet light from the sun, it changes to vitamin D in an inactive form.
hope this helps!
The correct answer is b. All the other answers suggest that white blood cells are involved with the transportation of oxygen, whereas this is the job of red blood cells.
The answer is both minerals are dull non metallic minerals do not shine on their own
