In those ecosystems marine and Lake the area photic is one in which penetrates the light of the Sun. Its depth is very variable depending on the turbidity of the water.Conversely, the aphotic zone is the one that is not possible the development of photosynthesis, since less than 1% of sunlight penetrates it. The aphotic zone is divided into two parts: the bathyal zone between 200 and 2000 meters deep and the huge area with more than 2000 meters of depth.
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