2NO + O2 2NO2

The formation of photochemical smog is a result of a series of reactions between chemicals in the atmosphere and light. The oxidation of nitric oxide is shown above. What is the most likely catalyst (depicted by the squiggly arrow) in this reaction?

A)Sunlight
B)water vapor
C)free radicals
D)atmospheric enzyme

where is the option.let me know

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.