Answer:
c
Explanation: Protozoa, algae, and non-microbial parasitic worms are studied in microbiology because they are all microorganisms that play important roles in various ecosystems and can have significant impacts on human health. a) is incorrect because while they are microscopic, their size is not the primary reason for their study. b) is incorrect because not all of these organisms cause infectious diseases. c) is the correct answer, as protozoa are studied in microbiology for their role in infectious diseases, and algae and non-microbial parasitic worms are also studied for their ecological and evolutionary significance.
