Question

which scientist developed the idea that microorganisms can cause diseases?
paul ehrlich
anton van leeuwenhoek
louis pasteur
alexander fleming

Explanation:

Paul Ehrlich is known for work on immunology and chemotherapy. Anton van Leeuwenhoek is credited with discovering microorganisms but not the germ theory. Louis Pasteur developed the germ theory, proposing that microorganisms cause diseases. Alexander Fleming discovered penicillin.

Answer:

Louis Pasteur