Which statement best describes how Watson and Crick's model used other scientists' work to create a model of DNA? They used Chargaff's rule to determine that it contains ribose sugar. They used Franklin's photo to determine that DNA was a double helix. They used Levene's work to determine the number of base pairs in each strand. They used Nirenberg and Matthei's studies to determine that DNA is made of nucleotide

The correct statement is-

They used Chargaff's rule to determine that it contains ribose sugar.

They used Franklin's photo to determine that DNA was a double helix.

Explanation:

Watson and Crick used pieces of information available from different researchers such as Chargaff's rules and Franklin.

Chargaff had explained that of the four kinds of nucleotides are present in a DNA molecule in such a manner that 2 types of nucleotides were always present in the same amounts and the other 2 types of nucleotides were also always present in same amounts.

The first X-ray picture of DNA, created by Rosalind Franklin using a technique known as X-ray crystallography, which led to Watson and Crick's model of DNA. It explained the helical shape of the DNA molecule.

The correct statement is-

They used Chargaff's rule to determine that it contains ribose sugar.

They used Franklin's photo to determine that DNA was a double helix.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%