Gas and Exchange in a Protozoan
Protozoa are small, unicellular, eukaryotic organisms, belonging to the kingdom Protoctista. The term ‘protozoa’ is used more for the animal-like single celled organisms like amoebas and ciliates. Examples of protozoa are Amoeba spp. and Paramecium spp., both of which live in water and obtain their oxygen from their environment.