The open-ocean zone is further divided into which zones?

The first three zones of the ocean are called the Intertidal zone, the Neritic zone, and the Open ocean zone.

The open-ocean zone is then split into 3 subzones. These subzones are called; The sunlit zone, twilight zone, and the benthic zone.

The sunlit zone is home to the plankton and jellyfish. The twilight zone is home to the giant squid and deep-sea hatchet fish. The benthic zone has over 200,000 plants and animal species that do not need light to survive.

Explanation:

the missing space is phylum