A man steps out of a plane at a height of 4000 m above the ground, falls 2000 m very quickly, and then opens his parachute and slowly falls the
remaining 2000 m to the ground. What height above the ground would be the
best choice for a reference point?
O A. 6000 m
OB. 4000 m
C. Om
OD. 2000 m

Ch to C k it b be no

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.