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Believed in chemical treatment

Believed that seeds in the air caused disease

Created a better understanding of the digestive system

Saw urine as an inaccurate diagnostic

First person to describe the basic unit of human beings as a 'cell'

Drew detailed diagrams of magnified objects, such as fleas

Published 'observations medicae', which rejected the four humours

Allowed the microscopic study of animalcules (bacteria)

Made first recorded image of bacteria/animalcules

Discovered structure of DNA