Your skin is the largest organ of your body. the skin and its appendages, hair and nails, are known as the integumentary system. all but one of these are functions of your skin. a) aids in the production of vitamin d b) regulate your body temperature c) first line of protection against invaders d) semipermeable membrane to substances like glucose

D

Explanation:  

Your skin is not a semipermeable membrane to substances like glucose. Your cell membrane is the semipermeable structure that allows substance, such as glucose and water, to enter your cells.

ill try to . no promises tho.

explanation:

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)