Question

All of the following are types of microorganisms, except _____.

1.bacteria
2.virus
3.parasitic worms
3.rickettsias

Answer 1

All the choices are microorganisms apart from parastic worms. Microorganisms are microscopic organisms that can be single celled or multi-celled. On the other hand a parasitic worm is a disease causing organism that is found in humans. Some of these parasitic worms can be seen with the naked aye and hence are not microscopic.