Chapter 4.4, Problem 16AYP

Summary Introduction

To describe:

The protozoan characteristics that illustrates why protozoa are informally placed into a single group.

Concept introduction:

All protozoan organisms are grouped together as protozoa due to their physical features, and not genetic ties. Most protozoa organisms are free-living and do not cause harm. However, a few protozoa speciesare known to be pathogenic and cause a number of infections in humans.