So that we do not contaminate it with microorganisms or garbage or other human stuff.
Friction occurs when the surfaces and heat of two surfaces grind against each other.
I think these are the answers
I think the correct answer from the choices listed above is option A. The rent is an<span> example of a monthly fixed cost for a sandwich shop. It is a fixed cost since you are required to pay for it per month. Hope this answers the question. Have a nice day.</span>