The best and most correct answer among the choices provided by your question is the first choice or letter A. The swamp forests formed into tropical rain forests.
The Carboniferous Period<span> is famous for its vast swamp forests, such as the one depicted here. Such swamps produced the coal from which the term </span>Carboniferous<span>, or "carbon-bearing," is derived. The </span>Carboniferous Period<span> lasted from about 359.2 to 299 million years ago* during the late Paleozoic </span>Era<span>.</span>
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The balance shifted in many ways both economic and political.
Before the war, Germany, Russia, and Austria had their empires. After the war Austria-Hungary was ended, Germany lost territory and was no longer a world power and was ruined, and Russia stopped being an Empire and became USSR. There was a new nation called Yugoslavia and many people in Europe started to get influenced by communism. France emerged as a proud victor from the war and along with Britain was the dominant force in Europe.
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