Today's fossil fuels began forming 300 million years ago. What allowed the process to begin?

A Mammals ate all of the plants
B Rainfall eroded huge mountains
C Dinosaurs roamed the land
D Many huge plants grew, died, and decayed

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um a little more help please

Please do not double post.

Read the post on the net. It tells you EXACTLY what you want to know.

um a little more help please

my mistake