What is a huge source of methane gas? *

oil and gas systems, livestock enteric fermentation, and landfills.

Explanation: //Give thanks(and or Brainliest) if helpful (≧▽≦)//

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A huge source of methane gas is natural wetlands because soil microbes and plants are forced to metabolized under anaerobic conditions so this leads to methane production.

do you have a picture?

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.