Dmitri Ivanovski demonstrated that TMV was not spread via bacteria by
A. transmitting sap of infected plants from generation to generation.
B. treating an infected plant with a broad spectrum of antibiotics before extracting sap.
C. filtering sap from an infected plant through pores smaller than bacteria, and then applying it to a healthy plant.
D. sterilizing sap from an infected plant and then applying it to a healthy plant.
E. spraying sap from an infected plant onto a healthy plant.
Answer: C
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