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The invention of the microscope was required before researchers could start studying cells.
The correct answer is A.
Who made the microscope?
Zacharias Janssen
The usage of a microscope, a discovery that dates back to the late 16th century and a modest Dutch eyeglass manufacturer named Zacharias Janssen, has helped every major branch of science. One classification is based on the element that interacts with the material to produce the image, such as light or photons (for optical microscopes), electrons (for electron microscopes), or a probe (scanning probe microscopes).
Which two basic types of microscopes are there?
There are two different kinds of microscopes: Simple and compound microscopes both consist of lenses, with a simple microscope having a single lens and a compound microscope having multiple lenses.
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