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q no. 1 what is crucial to maintain health
q no. 2 what can affect the immune system.
q no. 3 which type of cell protect our body against viruses,bacteria and even cancer.
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why is sleep is crucial?
when our immune system works best?
where natural disease killers are generated?
yes our immune system works best when we sleep.
yes without sleeping enough can affect immune system.
hope this is help you..
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