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In 1898 Friedrich Loeffler and Paul Frosch found evidence that the cause of the highly contagious hoof-and-mouth disease in livestock was a microscopic infectious particle. It was discovered that this particle requires a host cell to reproduce. Which pathogen is most likely responsible for causing the hoof-and-mouth disease in livestock? Your answer: A virus because it requires a jost cell to reproduce B protist because it is microscopic C fungus because it infects livestock

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Answer:

A. virus because it requires a host cell to reproduce

Explanation:

This is probably a viral disease (and from an internet search, I can confirm that it is). A good way to understand this is that from the information given, we should infer that it's a viral disease: viruses are microscopic, infectious, and need a host cell. Protists and fungi just aren't good answers, because protists don't infect people usually, and fungi are not always microscopic.

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