Currently, fossil fuels are one of the world’s primary energy sources. The graph shows the amount of carbon that has been released in the atmosphere since 1900 due to the burning of fossil fuels.

Because its reliable.   there is no pollution  the chances of a radiation leak is low

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.