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Chromosome are part of DNA cells and threads like structure which contains the human genetic coded information for the humans . humans have total 46 chromosomes .
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One Idea was the appreciation that the age of the Earth was much greater than had hitherto for been imagined.
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There is a great deal of diversity in life on Earth because the planet has so many different climates that life has adapted to and colonized.
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ABO blood group system, the classification of human blood based on the inherited properties of red blood cells (erythrocytes) as determined by the presence or absence of the antigens A and B, which are carried on the surface of the red cells.
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