Question

Which of the following represents the correct order of events?
A.the element oxygen was discovered, urea was synthesized, proteins were crystallized, the structure of DNA was discovered
B.the structure of DNA was discovered, proteins were crystallized, the element oxygen was discovered, urea was synthesized
C.the element oxygen was discovered, proteins were crystallized, the structure of DNA was discovered, urea was synthesized
D.urea was synthesized, proteins were crystallized, the element oxygen was discovered, the structure of DNA was discovered

Answer 1

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Answer 2

I thinking D because it is obvious that DNA was the last thing to be discovered and urea was synthesized and proteins crystallized a LONG time ago so to me that one makes the most sense.