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Author Question: Which of the following has emerged as one of the most pressing challenges of the early 21st century? (Read 192 times) |
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The horizontal fraction bar was introduced by the Arabs.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Asthma-like symptoms were first recorded about 3,500 years ago in Egypt. The first manuscript specifically written about asthma was in the year 1190, describing a condition characterized by sudden breathlessness. The treatments listed in this manuscript include chicken soup, herbs, and sexual abstinence.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.