Why would you not expect to find algae in the abyssal zone of the ocean?

Algae require sunlight for photosynthesis, which is not available in the abyssal zone due to its extreme depth, typically below 2,000 meters where light penetration is minimal to nonexistent. The absence of sunlight limits the growth of photosynthetic organisms like algae. Additionally, the conditions in the abyssal zone, such as high pressure and low temperatures, make it an inhospitable environment for most types of algae. Instead, life in this zone relies on organic material that falls from upper layers of the ocean or chemosynthesis near hydrothermal vents.