C) If your displacement is 19.3m and your final position is 31.8m, what was your initial position?

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 answer is -6hope this

The fertilized egg  begins to develop into a hollow ball of cells called the blastocyst.