Question

Which zone within the open-ocean zone is home to the most organisms?

deep zone
surface zone
intertidal zone
transition zone

Answer 1

The zone within the open-ocean that is home to the most organisms is the **surface zone** (also known as the epipelagic zone). This zone receives ample sunlight, which supports photosynthesis and, consequently, a higher density of life, including phytoplankton, zooplankton, fish, and other marine organisms. In contrast, the other zones, such as the deep zone and transition zone, have limited light and lower biological productivity. The intertidal zone is not classified as part of the open ocean but is the area where the ocean meets the land.