Chlorella's a genus of single-celled green algae, belonging to the phylum Chlorophyta. It's spherical in shape, about 2 to 10 μm in diameter, and's without flagella. Chlorella contains the green photosynthetic pigments chlorophyll-a and -b in its chloroplast. Through photosynthesis it multiplies rapidly requiring only carbon dioxide, water, sunlight, and a small amount of minerals to reproduce . The name Chlorella's taken from the Greek word chloros meaning green and the Latin diminutive s… (More on Chlorella)