question_answer

  Large amount of carbon dioxide is produced during cellular respiration, burning of fossil fuels and forest fires. Still the concentration of carbon dioxide in Earth's atmosphere is only 0.03% . On the planets Venus and Mars, it constitutes 95-97% of the atmosphere. Give reason for this difference.

Answer:

                  Earth's atmosphere has less carbon dioxide because;    (a) Green plants fix carbon dioxide during photosynthesis. (b) Most marine animals use, carbonates dissolved in sea water and make their shells.