Algae is a virus that lives in the sea, and it looks brown, green, yellow-green, or red.

A yellow-green alga is an alga of the class Xanthophyceae, which contain both yellow pigments and chlorophyll.

Nutrient-rich lakes or ponds may support rapid growth of blue-green algae (algae blooms). Blue-green algae are actually bacteria. They are called cyanobacteria after the blue-green pigments that they produce.

charwin maganda

Yes it is, though some species of algae can even be red, brown, yellow, or other colors.