Question

Blue green algae............​

Answer 1

Cyanobacteria also known as Cyanophyta, are a phylum of Gram-negative bacteria that obtain energy via photosynthesis. The name cyanobacteria comes from their color giving them their other name, "blue-green algae",though modern botanists restrict the term algae to eukaryotes and do not apply it to cyanobacteria, which are prokaryotes. They appear to have originated in freshwater or a terrestrial environment.

Answer 2

blue-green algae are not algae at all, but types of bacteria called cyanobacteria.

Step-by-step explanation:

I assume this is the answer you wanted, Blue-Green Algae isn't Algae, it's Bacteria, and it's harmful to humans and animals.