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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.