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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

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

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

No Smoking No Smoking
It is important to act concerned when a patient is upset. It is important to act concerned when a patient is upset.
Is there anything in life that is permanent, or is the world constantly changing? Is there anything in life that is permanent, or is the world constantly changing?
As with smoking, drinking alcohol during pregnancy exposes the fetus to potentially toxic substances As with smoking, drinking alcohol during pregnancy exposes the fetus to potentially toxic substances
Access to Health Plus Mastering Health Access to Health Plus Mastering Health
Remaining health-adjusted life expectancy (years) at age 25 Remaining health-adjusted life expectancy (years) at age 25
Video: Covalent bonds - role in the body

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