In an aquatic ecosystem, what name is given to the region where photosynthesis can occur

  Photic zone

The photic zone or euphotic zone is the uppermost layer of water in a lake or ocean that is exposed to intense sunlight. On the average, the photic zone of an ocean reaches around 200 meters in depth. At this depth, enough sunlight can penetrate to permit photosynthesis which encourages the growth of a wide variety of flora and fauna. 

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explanation:

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the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.