What did Rosalind Franklin contribute to the effort to identify the structure of DNA?

What did Rosalind Franklin contribute to the effort to identify the structure of DNA? 



a. models made of cardboard and wire showing the shape of DNA
b. the ratios of the two sets of nucleotide pairs in DNA
c. radioactive evidence that DNA carried the genetic code
d. x-ray diffraction photos of the DNA molecule


Answer: d. x-ray diffraction photos of the DNA molecule


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