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B
Improvement of telescope
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C
Discovery of cell
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D
Both A and C
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Solution
The correct option is A Improvement of microscope Antonie van Leeuwenhoek used single-lens microscopes, which he made, to make the first observations of bacteria and protozoa. His extensive research on the growth of small animals such as fleas, mussels, and eels helped disprove the theory of spontaneous generation of life.