Early in his medical life, Fleming became interested in the natural bacterial action of the blood and in antiseptics. He then served in World War I as the captain of the Medical Corps, as he continued his studies and started to work on antibacterial substances which would not be toxic to animal tissues. In 1921, he discovered in tissues and secretions

Some common words found in the essay are:
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Approximate Word count = 368
Approximate Pages = 1 (250 words per page double spaced)