One reason why there tends to be more organisms in the photic zone than in the aphotic zone?

The photic zone, which extends from the surface of the water down to about 200 meters, receives sunlight that supports photosynthesis, allowing plants and phytoplankton to thrive. This primary production forms the foundation of the aquatic food web, attracting a diverse array of organisms, including herbivores and predators. In contrast, the aphotic zone lacks sufficient light for photosynthesis, resulting in fewer organisms and a more limited food supply. Consequently, the photic zone supports a greater abundance and variety of life compared to the aphotic zone.