Joseph Lister
A. pioneered the use of gamma rays for sterilizing food.
B. designed and built the first autoclave.
C. demonstrated that microorganisms are carried on dust particles in the air.
D. revolutionized surgery by introducing phenol as a disinfectant.
Answer: D
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The first amphibians appeared during the _____ period.
A. Silurian B. Carboniferous C. Cambrian D. Devonian E. Ordovician