Nancy's diet is deficient in iodine. this will affect the secretion of which hormone?
thyroxine
thyroid–stimulating hormone
growth hormone

The correct answer is thyroxine. It is a hormone produced by the Thyroid gland and is one of the most important hormones for the regulation of metabolism. If the thyroid gland does not work well and those not produce not only this but a few other hormones, you better see a doctor fast becasue there's a high chance there's something serious going on.

C) to ensure each new cell has an exact copy of the dna