Vitamin D, officially classified as a vitamin, functions as a hormone in the body. What other hormone is necessary in the body for vitamin D to work

Answer should be b : ))

Agroup of engineering students from purdue university reported that its licking machine, modeled after a human tongue, took an average of 364 licks to get to the center of a tootsie pop. twenty of the group's volunteers assumed the licking challenge-unassisted by machinery-and averaged 252 licks each to the center.

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