Question

in the 1600s, which scientist discovered microbes in pond water by using a microscope?
theodor schwann
robert hooke
anton van leeuwenhoek
matthias schleiden

Explanation:

Anton van Leeuwenhoek is known for using a microscope to observe and discover microbes in pond water in the 1600s. Theodor Schwann and Matthias Schleiden contributed to cell theory. Robert Hooke is famous for observing cork cells and coining the term "cell".

Answer:

Anton van Leeuwenhoek