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thru their leaves.

Edited answer:

Partly from the process of photosynthesis during day time and partly from the air through the stomata during gaseous exchange.

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Plants obtain oxygen for their survival through a process called photosynthesis. During photosynthesis, plants use sunlight to convert carbon dioxide into oxygen as a byproduct. This oxygen is then released into the air, which plants and other living organisms need to breathe and survive.


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