Biology, 10.07.2019 05:50, nmm32

In the early days of germ theory, contagious diseases were thought to be caused by fungi or bacteria. in the 1890s, dmitri ivanovski filtered extracts from diseased tobacco plants and discovered that the disease could be transmitted to new plants through the filtrate. he concluded that the disease was caused by particles smaller than bacteria: the tobacco mosaic virus.

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In the early days of germ theory, contagious diseases were thought to be caused by fungi or bacteria...