Where does most of the primary production occur in an ocean ecosystem?
a. first 50 feet
b. first 200 feet
c. first 300 feet
d. first 100 feet

Primary production of any ecosystem is the production of chemical energy from light dependant reactions carried out by producers, the producers for the marine ecosystem are found near the ocean surface so the answer is a. first 50 feet.

Because it's sugar that us the answer