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Answer:
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Explanation
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These one-cell organisms are responsible for illnesses such as strep throat<span>, urinary tract infections and </span>tuberculosis<span>. Viruses. Even smaller than bacteria, viruses cause a multitude of diseases — ranging from the common cold to </span>AIDS<span>. Fungi. </span>
The answer is experience.
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3: opiates, came along in the 19th century..was widely used during the civil war as well..
