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.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.