A 100 kg cart goes around the inside of a vertical loop of a roller coaster. The radius of the loop is 3.3 m and the cart moves at a speed of 7.6 m/s at the top. The force exerted by the track on the cart at the top of the loop in N is?

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

C. it comes from the core of the earth.