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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

Average Normal Blood Pressure Readings Average Normal Blood Pressure Readings
Using a scan tool to check battery voltage. Using a scan tool to check battery voltage.
Using a scan tool to check for IAC counts or percentage as part of a diagnostic routine. Using a scan tool to check for IAC counts or percentage as part of a diagnostic routine.
Touch the test light to the negative (–) terminal of the battery or a good engine ground to check ... Touch the test light to the negative (–) terminal of the battery or a good engine ground to check ...
A random sample of 87 airline pilots recruited by an airline service had an average yearly ... A random sample of 87 airline pilots recruited by an airline service had an average yearly ...
In 2000, the average charge of tax preparation was 95 . Assuming a normal distribution and a ... In 2000, the average charge of tax preparation was 95 . Assuming a normal distribution and a ...
Video: Evolutionary tree of life Animation

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