In a 300-500 word response. Cite reference materials using proper MLA or APA bibliographic citation. 

1) Most reef-building corals have communal algae actually living inside the flesh of the corals. Why do you think this might be more efficient than coral eating phytoplankton? Please name these symbiotic algae and tell what limiting factor their presence in corals give the coral animals in terms of where they can grow. In any case, corals are almost all carnivorous.