What is the base pairing rule of Watson and Crick ?

What is base pair rule?

Write the contribution of Watson and Crick

______ stated base pair rule.

What is true for Watson and Crick's model of DNA ? It is duplexed with :

Write a note on the salient features of the Watson and Crick model of the DNA.

The double helical model of the DNA was proposed by Watson and Crick based on what data produced by wilkins and Franklin

What background information does Watson and Crick had, that helped them in developing a model of DNA? What was their contributions in the history of DNA?