7 classes of microbes v

Bacteria

 Single-celled prokaryotic microorganisms that do not have a nucleus.

Archaea

Single-celled prokaryotic microorganisms that often live in extreme environments. 

Fungi

A group of eukaryotic organisms that absorb nutrients from their environment, often from dead or decaying matter.

Protozoa

 Single-celled eukaryotic microorganisms that are usually heterotrophic, meaning they eat other organisms or organic matter. 

Algae

Simple photosynthetic organisms that usually live in water and make their own food using sunlight. 

Helminth

A parasitic worm that lives in or on a host and gets nutrients from it.

Virus

 A tiny infectious agent that can only reproduce inside a living host cell.