Discussion
The first person to observe living single-celled organisms was
Answer: B
Correct answer: Anton van Leeuwenhoek
Leeuwenhoek ground his own single-lens microscopes to a quality nobody matched for over a century, and with them observed bacteria, protozoa and spermatozoa in the 1670s, calling them animalcules. The distinction from Hooke is worth holding: Hooke named the empty compartments of dead cork, Leeuwenhoek watched living single-celled organisms swimming.
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