C. The increase in the use of coal as a source of heat and energy
In the long geological history of the Earth, humans first appeared during the Pleistocene Epoch, which dates back 1.6 million years to 10,000 years ago.
Answer:
When its charter expired in 1836, the Second Bank ended its operations as a national institution. It was reestablished as a commercial bank under the laws of Pennsylvania, where it continued to operate until its failure in 1841.
It was "Trotsky" who welded the new Red Army into a disciplined fighting force, although his efforts would prove ultimately to be in vane since he was later persecuted for being a traitor to the state.
