Why excretion of waste products is necessary from body?

Why excretion of waste products is necessary from body?
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Answer :

• Higher amount of carbon dioxide can lead to lowering of pH which can be dangerous for life. It should be quickly removed otherwise it may also be very harmful. 

• The concentration of water in the tissue fluid of mammals is maintained within the range 97-99%. In blood water is about 92%. If water exceeds this level then it collects in the tissues causing dropry. If the water level falls this normal line, it can cause dehydration of body. 
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