Correct Answer: D
Humans are covered in sweat glands and lots of them! Your 2 million to 5 million eccrine sweat glands kicked into action when you were a toddler and will be working to keep you cool for your entire life. Fun fact: even though your body shape and size changes over the years, the number of sweat glands you have does not and the condition of hyperhidrosis (or excessive sweating) is not related to the number of sweat glands you have, but rather to the amount of sweat those glands produce and at what rate. Wondering how much sweat is too much and how hyperhidrosis is diagnosed? Check out the typical criteria here.
Baker LB. Physiology of sweat gland function: The roles of sweating and sweat composition in human health. Temperature (Austin). 2019;6(3):211-259. Published 2019 Jul 17. doi:10.1080/23328940.2019.1632145