Answer:
As depth increases in the benthic zone, there is a high pressure and limited light.
Explanation:
Benthic zone begins at the shoreline and extends downwards with the continental shelf. The benthic zone covers 70% of all earth. It can host ecosystems such as a coral reef and kelp forest. In some parts of the benthic zone, at a deeper water zone, there is high pressure, low temperature and low sunlight.
Pressure: As depth increases in the benthic zone, pressure also increases. High pressure in the zone makes a homogeneous environment and lack of oxygen develop anaerobic zone formation.
Light: In deep waters (between 200 and 1000 m), light is unable to penetrate to the lower level. Insufficient light leads toward a low photosynthesis rate which is the reason that food source comes from dead and decaying organisms drifting down from upper layers. This condition also leads to the formation of anaerobic conditions.
