How much is the probability of striking of artificial satellites in space?

Each satellite has an allocated location or orbit and its managers use on-board thrusters to keep it where it should be. When the propellant runs low, they use the last to de-orbit it in a controlled manner (barring problems).

Explanation:

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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.