Ответы и объяснения


water is necessary for life.All organism contain in, some drink it  and some live in it.Plants and animals require water that is  moderately pure. and they cannot survive. if water contains  toxic chemical or harmful microorganism . Water pollution kills large  quantity of fish, birds, and other animals, in some cases killing everything in an affected.So it is very important clean water.Water pollution occurs mostly, when people overload the water environment such as streams, lakes ,underground water ,bays or seas with waster or substances harmful to living beings.pollution  makes streams, lakes and coastal waters unpleasant to swim in or to have a rest. Fish and shellfish harvested  from polluted  waters may be unsafe to eat. People who polluted water can become ill, if they drink polluted water for a long time.