51. what is the importance of the photic zone in aquatic habitats? a. oxygen levels are very low in the photic zone, often resulting in mass mortalities. b. only plants can thrive in the photic zone. c. habitats that have a large photic zone are more likely to have a high level of nutrients d. predation is lowest in the photic zone e. the photic zone is where most primary production occurs

e. The photic zone is where most primary production occurs.

Explanation:

The photic zone can be define as the sunlight or photosynthetic zone. It is the uppermost layer of the water body like lake, ocean, pond or others. This zone receives the maximum sunlight in the entire water body. Thus this facilitates the growth of large number of plants and other autotrophs like diatoms. This is called as the zone of primary productivity because in water the sunlight and dissolved atmospheric carbon dioxide are available for conducting the process of photosynthesis.    

The photic zone is where most primary production occurs

Explanation:

amazon river is the right answer i took the test