Question

which scientist devised tests that helped confirm that bacteria and other microorganisms cause a variety of diseases?
○ robert koch
○ anton van leeuwenhoek
○ louis pasteur
○ alexander fleming

Explanation:

To determine the correct scientist, we analyze each option:

• Anton van Leeuwenhoek is known for discovering microorganisms but not for devising tests to confirm their role in disease.
• Louis Pasteur contributed to germ theory and developed pasteurization, but Robert Koch's postulates (tests) were crucial for confirming that specific microorganisms cause specific diseases.
• Alexander Fleming discovered penicillin, not for devising disease - causing microorganism confirmation tests.
• Robert Koch developed Koch's postulates, a set of tests that helped confirm that bacteria and other microorganisms cause various diseases.

Answer:

A. Robert Koch