Final answer:
Rosalind Franklin contributed to the double-helix structure of DNA through her work in measuring X-ray diffraction images. Her research provided crucial information that allowed Watson and Crick to confirm the double helix structure of DNA.
Step-by-step explanation:
Rosalind Franklin made invaluable contributions to the discovery of the double-helix structure of DNA through her work in measuring X-ray diffraction images of DNA.
Her X-ray diffraction images provided crucial information that allowed Watson and Crick to confirm that DNA forms a double helix and determine details of its size and structure. Franklin's research helped to establish the helical nature of DNA and provided important data for the formulation of the double-stranded structural model of DNA.