why do black women have extremely curly hair?
It's a gift.
Here is the reason i found on reddit.
Straight hair that lies flat tends to hold in heat. That's an advantage in cold climates.
Curly hair allows heat to escape while still providing protection from the sun to the skin underneath. That's an advantage in hot climates.
Melanin in skin (the part that makes it dark) tends to block what's needed to make vitamin D while offering some protection from sunburn - this is why people who live closer to the polar regions have far lighter skin: less danger of sunburn, and since they get so much less sunlight, they need to produce vitamin D much easier. People who live closer to the equator get a lot more sunlight, so they have all the vitamin D from sunlight they need, but the protection from sunburn is far more important.
