The axial matio is a term used to describe a rod$-$shaped molecule using the ratio of its length to its diameter. Given that the

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standard conformation of DNA in a physiological solution has a diameter of $2\mathrm{.}37nm,$ what is the axial ratio of the longest chromosome of Dnosophila melanogaster DNA, which is $21000m$ long? Please record your answer in scientific notation.

axial ratio: