By strengthening your body it allows it to take more hits or strain without becoming injured.
Answer:
because they partly copy the original ones thereby using substandard things to make them look like the originals
It is a good idea because it helps to detect if there is too much carbon monoxide in the house. If there is too much, it can be poisonous and the detector will let you know. this answer would be TO AVOID POISONING BY A BUILDUP OF CO GAS.
btw, is this platoweb? just curious.
