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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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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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People about to have surgery must tell their health care providers about all supplements they take.

Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into
An example of an intake screen in an electronic health record. An example of an intake screen in an electronic health record.
Drug tolerance: A shift in the dose-response curve to the right as a result of exposure to the drug. Drug tolerance: A shift in the dose-response curve to the right as a result of exposure to the drug.
Mastering Biology Question Mastering Biology Question
Mastering Biology Question Mastering Biology Question
Acquisition and Extinction of a Salivary Response Acquisition and Extinction of a Salivary Response
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