Ace the Arkansas Esthetician Test 2026 – Unleash Your Beauty Boss Potential!

Microbiology is the study of microorganisms, which are tiny living things such as bacteria, fungi, and viruses. Option B, the study of human diseases, is incorrect because while microbiology can be used to study and understand various diseases caused by microorganisms, its scope goes beyond just human diseases. Options C and D are incorrect because they do not pertain to the study of microorganisms, which is the main focus of microbiology. Therefore, the best answer is A, the study of microorganisms.