If you are talking about snakes eventually the new skin will be just like the old one so the snake using a rough surface the snake will repeatedly rub against until the old skin peels of revealing the new one underneath
I think the circulatory system is the best body system because we need the heart to stay alive, many people live with only one lung. but we need the respiratory system to let oxygen in, and let carbon dioxide out.
Answer:
You should not sell unprescribed medication to people is illegal because they could be considered drugs. It is unsafe because they do not need it, or if they did they could have their doctor prescribe it to them and they you would not need to sell it to them.
