The atmosphere consists of which concentrations of gases found in the troposphere?
Select one:
O a. 21% ozone (O3); 78% carbon dioxide (CO2);
0.0034% nitrogen (N2)
O b. 0.0034% carbon dioxide (CO2); 21% oxygen
(02); 78% nitrogen (N2)
O c. 0.0034% oxygen (O2); 78% carbon dioxide (CO2);
21% nitrogen (N2)
O d. all atmospheric ozone (03)
O e. 78% methane (CH4); 21% oxygen (O2); 0.0034%
carbon dioxide (CO2)