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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

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Famous people who died from poisoning or drug overdose include, Adolf Hitler, Socrates, Juan Ponce de Leon, Marilyn Monroe, Judy Garland, and John Belushi.

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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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The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

Mutations caused by air pollution. Mutations caused by air pollution.
Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t
The cardiac cycle and an ECG tracing. The cardiac cycle and an ECG tracing.
The three types of muscle: Skeletal, cardiac, and smooth. The three types of muscle: Skeletal, cardiac, and smooth.
Negative reading oxygen sensor voltage can be caused by several problems. Negative reading oxygen sensor voltage can be caused by several problems.
Crown gall disease caused by Agrobacterium via plant transformation Crown gall disease caused by Agrobacterium via plant transformation
Video: Glycolysis - Introduction to ATP and the burning of sugar

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