What tool or technique used by Ivanowski and Beijerinck while studying diseased tobacco plants enabled them to determine that the disease was caused by an agent significantly smaller than bacteria?
A. transmission electron microscopy that allowed them to view the tobacco mosaic virus
B. porcelain filters that trapped bacteria but allowed passage of the virus
C. cell culture that enabled cultivation of the virus
D. scanning electron microscopy that enabled them to view the virus the tobacco mosaic virus
Answer: B
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