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Life span is the period of life from birth uptill natural death .
Life span of diffrent species is diffrent and it does not depend on the size of organism.For example .....Lifespan of  parrot is about 140years where as of crow it is only 15 years
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What u mean by we have to be diverse ?
Lifespan is the period  of your life on earth or from your birth till death. 
diversity  means being diverse. in life we have to be  diverse to win our race in this world
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What u mean by we have to be diverse ?we are homo sapiens and we will be that only no .....
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