A 70 kg skier is gliding at 2.0 m/s when he starts down a very slippery 50-m-long, 10' slope. What is his speed at the bottom? If the skier was gliding down the slope at a constant speed, how much work would be done by friction on the skier?

The low lands i believe

Letter a, because when there are unlike charges they will always attract to each other.

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.