Respuesta :

AL2006

Coal . . . . .

-- is a renewable resource that can easily be replenished.
   It happens by itself, and you don't even need to do anything,
   but it takes several million years.

-- Is formed from plant remains, and

-- is perhaps the MOST polluting energy source.

There is only supposed to be one answer choice, so the correct answer is is formed from plant remains.

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