Answer:
City in which Rosalind Franklin perfect her work in crystallograph in:
Paris (London)
Step-by-step explanation:
She made the important contribution in the discovery of double helical structure of the DNA. She learned crysatallographic X-Ray technique which she applied to the structure of DNA fibers.
Scientists used her work as evidence to support the evidence in DNA model.
She was born in 1920 in London, England and earned the p.hd degree in Cambridge University.
The main topic of her degree was "The physical chemistry of solid organic colloid with special reference to coal".
The two scientists used her work : Crick and Watson got noble prize for the discovery of the double helical DNA . They clearly mentioned the efforts of Franklin work in their award lecture.