In Griffith's experiments,
A. mice infected with live nonvirulent bacteria developed pneumonia and died.
B. nonvirulent bacteria transformed the virulent bacteria into a nonvirulent variety.
C. mice infected with heat-killed virulent bacteria and heat-killed nonvirulent bacteria developed pneumonia and died.
D. mice infected with heat-killed virulent bacteria and live nonvirulent bacteria developed pneumonia and died.
Answer: D
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