Y is most likely to photosynthesis .
Photosynthesis the process in which the light energy is converted into the chemical energy, through the cellular respiration. Photosynthesis occur only in plants , the stomata helps in photosynthesis it traps the sunlight and includes water ,Co2 to create Oxygen and energy in the form sugar .
As the X remove CO2 which plays a crucial role in photosynthesis and Y has air which includes oxygen and Co2 etc so the photosynthesis is most likely to occur in Y .
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