Microscopic, single-celled organisms that often cause recurrent diseases are called
A) viruses.
B) protozoa.
C) parasites.
D) bacteria.

Question

Quizplus · Accepted Answer

The term "microscopic, single-celled organisms" describes protozoa, which are often responsible for recurrent diseases such as malaria, amoebic dysentery, and giardiasis. Viruses are not single-celled organisms and are not always responsible for recurrent diseases. Parasites and bacteria may also cause recurrent diseases, but they are not always single-celled or microscopic.

Microscopic, Single-Celled Organisms That Often Cause Recurrent Diseases Are Called