Answer:
I beleive its 1
Explanation:
So basicaly you need to find the main idea of the subheading. It is talking about how it sends signals to your brain. This would help the reader because its giving a small peice of additional information. Also, lets look at the other answers. The subheadings arent comparing anything, so it cant be 2. it cant be 3 because its talking about sending signals to your brain. it doesnt say anything about the parts of your body that is covered in skin. Lastly, the main paragraph talks about how skin is important for your health. The subheading is only giving extra detail. I hope this helps, please mark branliest :)
