प्रकाश-संश्लेषण की क्रिया के दौरान पौधे तथा पेड़ कौन-सी गैस बाहर छोड़ते हैं? Which gas is released by trees and plants during the process of photosynthesis?

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प्रकाश-संश्लेषण की क्रिया के दौरान पौधे तथा पेड़ कौन-सी गैस बाहर छोड़ते हैं? Which gas is released by trees and plants during the process of photosynthesis?