Which of the following hydrocarbons will most likely be found around cows?

Methane, CH4, is the hydrocarbon most likely will be around cows.

CH4 gas is produced in the stomach of the cows product of to the grass ferments, which are difficult to digest.

In fact, cows are responsible for a huge amount of CH4 which is one of the greenhouse gases.  This a a subject of big concern and object of scientific research.

The answer should be vaporization 

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