I would say medicine that makes the immune system less effective so the likelihood of the immune system attaching the organ are decreased. Or the last option.
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DNA We can change how cells interact
The correct answer is option A
Water is the most important component of all living beings. The dependence of organisms on oxygen is much because it an important component of water which is required for the survival. The various types of life processes and metabolic reactions depends on the water to take place. The body is dependent on water for it.