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, in the 1600s, used a microscope to observe and discover microbes in pond water. Theodor Schwann and Matthias Schleiden contributed to cell - theory. Robert Hooke is known for coining the term "cell" when observing cork cells.

Answer:

Anton van Leeuwenhoek