Which organisms are larger and more complex than bacteria?

Protazoans are larger and more complex than bacteria due to their cellular structure and biological organization. Unlike bacteria, which are single-celled prokaryotes without a true nucleus or membrane-bound organelles, protozoans are classified as eukaryotes. This classification means they possess a defined nucleus and various specialized structures that allow them to perform complex functions necessary for their survival.

In addition to their larger size, protozoans exhibit a diverse range of forms and functions, often exhibiting behaviors and characteristics such as movement and predation that are not seen in bacteria. They play crucial roles in ecosystems, often serving as a link in food chains and participating in nutrient cycling.

This answer highlights the fundamental differences between these groups of organisms, clarifying the distinction that leads to protozoans being considered larger and more complex than bacteria.