There are a lot of differences between male and female anatomy. Obviously, females have distinct sex organs and hormones that allow them to carry babies, give birth, and breastfeed, but reproduction isn't the only area in which the sexes differ. Some of these differences are visible, while others manifest in less obvious ways.
One study shows that, across all populations, females have lighter skin tones than males. Light skin absorbs more vitamin D than dark skin. Women have a higher vitamin D requirement than males, especially during pregnancy and lactation, and researchers believe their lighter skin better enables them to absorb the nutrient naturally from the sun.
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