a group of plants or animals

the science that studies living organisms

in some classifications considered a kingdom

one-celled monerans having simple cells with rigid walls and (in motile types) flagella

prokaryotic organisms sometimes considered a class or phylum or subkingdom; coextensive with the Cyanophyceae: cyanobacteria (blue-green algae)

former term for the Cyanophyta

algae having chlorophyll a and usually c, and flagella of unequal lengths; terminology supersedes Chrysophyta in some classifications

the science that studies living organisms