why everyones dna is not the same.?
then this would have happened: parents
child 1 child 2
to to child 5 and child 6
now as we see
parent gave birth two child and so the two childs dna is same.then the child 1 gave birth two child 3 and 4.as child 3 and 4 s dna is same to child 1 then it should be same to child 2.and so the dna of child 3 and 4 and 5 and 6 will match.so in this way when family keeps changing the dna will match with everyone.so everyones dna would match now.but now it does not match why?
it may sound stupid but i am a student of 13 years and so i dont know about it much.thanks for viewing and further answering