The Coal and Oil That We Currently Use as Fuel

The coal and oil that we currently use as fuel sources ________.

A) are remnants of Sphagnum moss bogs
B) are releasing carbon that was trapped by photosynthesis in ancient vascular and seedless plants
C) come from calcium and magnesium carbonates that Carboniferous roots released from rocks
D) come from ancient, seed-bearing plants that grew during the Carboniferous period

Correct Answer:

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