A block oscillating on a spring has period of 2 s What is the period if the block’s mass is doubled? Note that you do not know the value of either m or k, so do not assume any particular values for them. The required analysis involves thinking about ratios.

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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.