A planet has a mass one-third the mass of the Earth and a radius three times that of Earth. What is the acceleration due to gravity on the planet in terms of g, which is the acceleration due to gravity on Earth?

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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.