Calculate the speed of propagation of a wave
represented by y = 0.5 sinx(0.01x-3t), where y and
x are in metre andt m sec

Efficiency is an act of doing something

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.

It is the areas with lines. this may sound a little confusing, but i hope it !