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On Venus and Mars, carbon dioxide forms what share of the atmosphere?

A95 to 97 per cent
B50 to 60 per cent
C20 to 30 per cent
D5 to 7 per cent
Answer & Solution
Correct answer: A. 95 to 97 per cent
1. No life is known on those planets. 2. Carbon dioxide is 95 to 97 per cent there. 3. On Earth life keeps it a fraction of a per cent. _Source: syllabus Science, Chapter 14, Natural Resources._
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