Who is the english scientist is known for scientifically describing gravitational force,

The objects are acted upon by only one force. gravity. mass times the acceleration of gravity (-9.81meters/second squared).

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.