Question

multiple choice 1 point the ocean has many zones that are characterized by depth. the deepest zone of the ocean, the hadalpelagic zone extends from 6,000 meters (19,700 feet) to the very bottom, 10,994 meters (36,070 feet) in the mariana trench off the coast of japan. which statement about the deep ocean zone is true? 1. coral reefs are commonly found in this zone. 2. plankton dominate this zone of the ocean. 3. some organisms in this zone use chemicals for energy rather than sunlight. 4. organisms in this zone must be able to survive major changes in salinity.

Explanation:

Coral reefs require sunlight for photosynthesis - dependent organisms like zooxanthellae and are found in shallow - water zones, not deep ocean zones. Plankton are more common in shallower, sun - lit surface waters. In the deep ocean (especially the hadal zone), sunlight is absent, so organisms rely on chemosynthesis using chemicals for energy. Also, deep - ocean organisms must be adapted to stable salinity levels rather than major changes.

Answer:

Some organisms in this zone use chemicals for energy rather than sunlight.