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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there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles