section_path: Symbiotic algae/Sea sponges
section_name: Sea sponges
paragraph_text: Sea sponges
  
  Endosymbiontic green algae live close to the surface of some sponges, for example, breadcrumb sponges (Halichondria panicea). The alga is thus protected from predators; the sponge is provided with oxygen and sugars which can account for 50 to 80% of sponge growth in some species.