11 lakh 97 thousand 500 rupees of oxygen is obtained from a tree in 50 years, understand the importance of trees | 50 વર્ષમાં એક ઝાડમાંથી 11 લાખ 97 હજાર 500 રૂપિયાનો ઓક્સિજન મળે છે, વૃક્ષોનું મહત્વ સમજો
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