Which pair of quantities represent scalar quantities? A. displacement and velocity
B. displacement and time
C. energy and velocity
D. energy and time

What even is this. where is the question

Domain eukarya; kingdom plantae should be the answer.

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.