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he described the circulation of blood.
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he first observed living bacteria.
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known for population growth and the effects of it.
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he used cowpox to immunize against smallpox.
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he formed a theory to explain how evolution may take place.
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became a trained nurse.
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he invented sterilization.
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he proposed principles of how traits may be inherited through generations.
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he proved that Bacillus anthracis causes anthrax.
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uses steril surgical techniques.
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founded the red cross.
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he determined three of four blood types (A,B,and O)
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he invented Salversan, which is a drug for syphilis.
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he discovered antibiotic effects of penicillium mold.
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he formed the fist blood bank.
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he set up collection centers for blood to fill World War 2 needs.
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he isolated penicillin and created the first antibiotic drug.
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he introduced the plastic bag to collect blood.
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he introduced an injectable polio vaccine.
