Sebaceous glands produce a substance that moisturizes and protects the skin.Because it produces a substance called sebum. The sebum moisturizes the skin and form a protective layer from infections.
Well if you're referring to the human body, our cells make up a lot of everything we're made of. Muscles, organs, bones, blood, skin, etc. Biologically speaking, there's a lot to the human body besides organs. Sorry if this isn't very helpful.
Because you have no control over it
He is on defense.
his role is to keep the other team from scoring, or "defend" the goal, hence, he is on defense.
