Answer: iodine
<span><span>A deficiency of iodine will cause the thyroid gland to enlarge and the person to become sluggish. Noncancerous enlargement of the thyroid gland due to deficiency In iodine in the diet is known as goiter. Iodized salt provides plenty of iodine.</span></span>
G0 phase cells
The mitotic cycle of somatic, or body, cells is responsible for the production of copies of those cells. The mitotic cycle has different phases, each of which involves a different set of physiological changes to the cell. The G0 phase is described as the resting phase of a cell, where no activities relating to cell division are taking place. G0 phase cells remain in this phase their entire lives, so they do not divide. Another example of such a cell is found in red blood cells.