The U.S. Constitutionâs 10th Amendment is arguably the most important of all the amendments in the brilliant document that helped shape the United States.
Not even identical twins have the same DNA--although theirs would be far closer than anyone else's. DNA changes over time. Odds of two siblings having the same DNA who did not split from the same zygote are vanishingly small.
   Some 90+% or so of human DNA is the same between members of the  same species, but in a single human body--We have two copies of  each chromosome, two copies of every gene, and it is possible to  have two copies of the same allele.here may be some DNA in some dirt samples, but this DNA does not belong to the dirt, rather to something that has somehow deposited its DNA into/onto the dirt, likely through decomposition. If dirt had DNA, and that DNA had the same properties as human DNA, then dirt would look exactly like humans.