cyanobacteria (blue-green algae) is an example of what type of plankton
Cyanobacteria / saɪˌænoʊbækˈtɪəriə /, also known as Cyanophyta, are a phylum of bacteria that obtain their energy through photosynthesis, and are the only photosynthetic prokaryotes able to produce oxygen. The name "cyanobacteria" comes from the color of the bacteria (Greek: κυανός, translit. kyanós, lit.' blue'). Cyanobacteria (which are prokaryotes) used to be called "blue-green algae". They have been renamed' cyanobacteria' in order to avoid the term "algae", which in modern usage is restricted to eukaryotes.