A molecule that diffuses down a concentration gradient goes from an area of c2 concentration into an aria of c3 concentration
Their cells have a mutation normal cells do not.
The solid inner core is made of mainly iron crystals with small amounts of nickel and heavier elements such as gold and platinum. The liquid outer core is a nickel iron alloy with small amounts of heavier elements.
Isokinetic exercise is often used to regain muscle strength