Final answer:
Anton van Leeuwenhoek termed the phrase animalcules to describe live organisms observed under a microscope.
Step-by-step explanation:
Anton van Leeuwenhoek termed the phrase animalcules to describe the live organisms observed in his microscope. He was a Dutch scientist who is often considered the father of microbiology. Leeuwenhoek made significant contributions to the field of microscopy and was the first to observe and describe various microorganisms, including bacteria and protozoa, which he referred to as animalcules.
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