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. which best explains how ivanovski’s work led to a change in the germ theory?
he tried to promote his hypothesis as a law.
he used a new experimental method to test his hypothesis.
he used a more powerful bacterial strain than other scientists had.
he obtained results that confirmed what other scientists were thinking.

Correct B). He used a new experimental method to test his hypothesis.

The germ theory of the disease is the theory that states that the disease in humans and plants are caused by the microorganisms. Before the 19th century, it was believed that communicable disease is caused by bacteria and fungi. Viruses were not discovered at that time.

The work of Ivanovski on the tobacco plant was responsible for the discovery of viruses.

Hence, the correct answer would be option B.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.