Antony Van Leeuwenhoek invented the first microscope that could see cells. So, in the 17th century, a simple microscope must have been used to see the cells and distinguish between them.
The 20th century saw a development in the field of microscopy. Microscopes like phase contrast microscope developed by Frits Zernike and transmission electron microscope invented by Ernst Ruska and Max Knoll were used for many purposes.
In the 21st century, microscopes like digital and stereo microscopes are used.
In the 21st century, the digital microscope can be used to distinguish between a unicellular and a multicellular organism.
A microscope is a device that can be used to see cells. Microscopes were first invented by Robert Hooke. In the 17th century (1600s), Antony Van Leeuwenhoek developed a simple microscope that can distinguish between a unicellular and a multicellular organism.
In the mid-20th century (1900s), a transmission electron microscope could be used to distinguish between a unicellular and a multicellular organism.
In the 21st century, the digital microscope can be used to distinguish between a unicellular and a multicellular organism.
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