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

The work of Ivanovski resulted in a change in the germ theory as he used a novel experimental approach to test his hypothesis. According to the germ theory, the diseases are caused by microbes. Before the 1890s, it was considered that communicable diseases are caused by microbes like fungi and bacteria, as viruses were not familiar at that time.  

The work of Ivanovski on the tobacco plant was the one that led to the discovery of the prevalence of viruses. Ivanovski was able to get to the conclusions as he used a new experimental method to examine his hypothesis.  

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

oxidation

explanation:

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