Osteoarthritis in the lumber vertebrae is caused due to degenerative disorder or due to injury in the backbone/cartilage. The high rate of lumber vertebrae osteoarthritis indicates the presence of genetic disorder only, which means the Native American tribes carried a gene for this disorder, which was only expressed in the female offsprings.
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Answer
Scientists are unable to find nucleotide in water because of the following factors:
Reason 1.
Water is polar molecule while nucleotide is an organic molecule and is not soluble in water.
Reason 2
Nucleotide is the main component of nucleic acid, while water is composed of hydrogen and oxygen.
Reason 3
The nature of bond n both molecule is different.
thats why scientists are unable to find nucleotide in water.
The answer is mutations in a gamete, I believe.