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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 heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

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Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

Keystone species. Keystone species.
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Human beta-globin–complex locus control region Human beta-globin–complex locus control region
Video: Red alga life cycle Animation

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