Eukaryotes - Kingdom Protista

Unicellular organisms live as single, self-sufficient cells and display great biological diversity. Kingdom Monera includes prokaryotes such as bacteria, which lack a nucleus and membrane-bound organelles. Kingdom Protista includes eukaryotic unicellular organisms like amoebas and algae, which have more complex internal structures. Together, they highlight the wide range of life forms that exist at the microscopic level.