how are green algae different from cyanobacteria?
Green algae are eukaryotic, whereas cyanobacteria are prokaryotic.
“Green algae” is the common name for Chlorophyta. “Blue-green algae” is the common name for Cyanobacteria.
Eukaryote cells have a nucleus and membrane. Prokaryote cells do not have a nucleus or membrane and lack many of the organelles present in eukaryotes.
For similarities: green algae and blue-green algae are both photosynthetic organisms.
Despite its common name of blue-green algae, cyanobacteria can appear in a number of colors including red. It is thought that the presence of cyanobacteria on the water’s surface is what inspired the name of the Red Sea.