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Carbon, hydrogen and oxygen are mainly obtained from:

AAcid and water
BAir and wax
CAcid and wax
DAir and water
Answer & Solution
Correct answer: D. Air and water
1. The other macronutrients come from the soil. 2. These three come from a different source. 3. They come from carbon dioxide and water. _Source: syllabus Biology, Ch 12 'Mineral Nutrition'_
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