Because it is present in the earliest cell that lived in earth
<span>The main difference between DNA and RNA is that DNA contains double-stranded molecules and RNA contains single-stranded molecules. DNA stands for deoxyribonucleic acid and RNA stands for ribonucleic acid. Both DNA and RNA carry genetic information, but there are a few major differences between them. DNA consists of the sugar deoxyribose, and RNA contains the sugar ribose. Ribose contains one more -OH group than deoxyribose. Another difference is that DNA is stable under alkaline conditions while RNA is not stable.</span>
Specific proteins produced in a cell are directly related to the nucleotide sequence in the DNA of a cell.
Some form of plant life. It could be a tree, flower, even a simple blade of grass.
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Physical indicators of healthy water quality are temperature<span> and turbidity.
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