Algae is the term for several groups of simple living organisms
that capture light and process it through photosynthesis to
create the energy they need to live and grow. They can occur in
most habitats but are usually found in damp places or bodies of
water. Phytoplankton, living in oceans and lakes is the basis
for most marine food chains. Some are used as human food or
harvested for useful substances such as agar or fertilizer. Red
Algae is different from the other species; it is classified in
Phylum Rhodophyta, not Phylum Phaeophyta like the others. Red
Algae is multicellular and live warm marine environments rather
than cold. It is actually rather similar to coral. Reference:
Exploring Creation with Biology Wile and Durnell