▁identify ▁the ▁following : ▁ ▁The ▁in fr al itt oral ▁zone ▁is ▁the ▁alg al - domin ated ▁zone ▁down ▁to ▁around ▁five ▁metres ▁below ▁the ▁low ▁water ▁mark . ▁ ▁The ▁cir cal itt oral ▁zone ▁is ▁the ▁region ▁beyond ▁the ▁in fr al itt oral , ▁which ▁is ▁domin ated ▁by ▁sess ile ▁animals ▁such ▁as ▁o yst ers . ▁ ▁The ▁subt idal ▁zone ▁is ▁the ▁region ▁of ▁the ▁ner it ic ▁zone ▁which ▁is ▁below ▁the ▁inter tid al ▁zone , ▁therefore ▁never ▁exposed ▁to ▁the ▁atmosphere . ▁ ▁Phys ical ▁characteristics ▁ ▁The ▁ner it ic ▁zone ▁is ▁perman ently ▁covered ▁with ▁generally ▁well - ox y gen ated ▁water , ▁receives ▁plenty ▁of ▁sun light ▁and ▁has ▁low ▁water ▁pressure ; ▁moreover , ▁it ▁has ▁relatively ▁stable ▁temperature , ▁pressure , ▁light ▁and ▁sal inity ▁levels , ▁making ▁it ▁suitable ▁for ▁photos yn th etic ▁life . ▁In ▁particular , ▁the ▁b enth ic ▁zone ▁( sh allow ▁ocean ▁floor ) ▁in ▁the ▁ner it ic ▁is ▁much ▁more ▁stable ▁than ▁in ▁the ▁inter tid al ▁zone . ▁ ▁Life ▁forms ▁ ▁The ▁above ▁characteristics ▁make ▁the ▁ner it ic ▁zone ▁the ▁location ▁of ▁the ▁majority ▁of ▁sea ▁life . ▁The ▁result ▁is ▁high ▁primary ▁production ▁by ▁photos yn th etic ▁life ▁such ▁as ▁ph y top l ank ton ▁and ▁floating ▁s arg ass um ; ▁zo op l ank ton , ▁free - f lo ating ▁cre atures ▁r anging ▁from ▁micro scop ic