Answers

2015-11-04T20:47:31+05:30
If living organisms did not have a life span they will live for long time like oak tree it lives upto 100 yrs
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2015-11-04T20:53:08+05:30
Life span is necessary to determine the life time of an organism 
if an organism doesn't have a lifespan it will live for ever and we can't even know when it die

Hope this may helps uu......
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