That ground glass lenses to very fine specifications so that he was able to develop a microscope for observing and describing living microscopic animalcules.

Antonie van Leeuwenhoek

Explanation:

Antonie van Leeuwenhoek was a Dutch linen merchant who specialized in grinding glass lenses to ever finer specifications. This grounded glass lenses built at an ever finer specifications was the groundwork for his manufacturing of the microscope that is used for studying and describing various living microscopic animalcules.

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