Dinosaurs. I do not know the specific one, but the animals that dominated the Mesozoic era was dinosaurs.
this is ur answer hope it helps .
In 2015, 33.2% of U.S. electricity came from coal— roughly equal to natural gas (32.7%), but greater than nuclear power (20%) or renewable energy sources (13%). There is an abundant supply of coal in the United States and it's a relatively inexpensive energy source so this is ur answer
