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

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.  

oxygen +1 most likely