What are the various forms in which oxygen is available?
(N/A) $(i)$ In the atmosphere,oxygen is found in the elemental form to the extent of $21 \%$.
$(ii)$ In combined form,it occurs as $CO_{2}$ both in the earth's crust as well as in the air.
$(iii)$ In the crust,it is found as the oxides of most metals and silicon,and also as carbonate,sulphate,nitrate,and other minerals.
$(iv)$ It is also an essential component of most biological molecules like carbohydrates,proteins,nucleic acids,and fats (or lipids).
$(ii)$ In combined form,it occurs as $CO_{2}$ both in the earth's crust as well as in the air.
$(iii)$ In the crust,it is found as the oxides of most metals and silicon,and also as carbonate,sulphate,nitrate,and other minerals.
$(iv)$ It is also an essential component of most biological molecules like carbohydrates,proteins,nucleic acids,and fats (or lipids).
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It is observed that the number of asthmatic patients is increasing day by day. It is due to urbanization,industrialization,and excessive use of vehicles. Sidak's mother took some initiatives to reduce this problem. She,along with her son and his friends,prepared data on the destinations colony people visit,the different routes taken,and the timings of their jobs,and arranged for carpooling.
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$(b)$ Explain the values shown by Sidak's mother.
$(c)$ Suggest other methods to reduce this problem.
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