Determine the resultant displacement of a man drives 3km east ward and then 4km, in each case

The center is basically the heart of it

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.

The sun's gravitational pull is weaker on the planets that are closer to it, i think.

I'm pretty sure the answer is c