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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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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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Cyanide works by making the human body unable to use oxygen.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.