Please help me!!!! If you don't know it then don't answer !!!!!!

Biology
Tutor: None Selected Time limit: 1 Day

Apr 24th, 2015

the answer is 25 % dear. its correct ! best my answer !

Apr 24th, 2015

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Apr 24th, 2015
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Apr 24th, 2015
Dec 4th, 2016
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