Which of the following is a group of one-celled organisms that do not have a rigid cell wall?
A)Algae
B)Protozoa
C)Fungi
D)Rickettsiae

Question

Quizplus · Accepted Answer

Protozoa are one-celled organisms found in freshwater and marine habitats and in moist soil.Their diet includes bacteria,small algae,and other protozoa.A small number of protozoa are responsible for intestinal infections of humans; others invade the blood,lungs,liver,or brain.
Algae range from microscopic single-cell organisms to larger multiple-cell organisms such as seaweed and kelp.
Fungi are organisms such as mushrooms,yeasts,and molds that lack chlorophyll.
Rickettsiae are short,nonmotile rods that are found in the intestinal tracts of some insects.

Which of the Following Is a Group of One-Celled Organisms