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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Unity was brought mainly by the decades-long process of setting up and expanding the European Union in the aftermath of WW 2; also the disappearance of the Iron Curtain in 1989 was a major factor in uniting Europe.
Major disruptive factors were of course the two World Wars, and before 1989, the existence of a Communist-dominated Eastern Europe versus Western Europe.
I believed among all the city states in Greece, the most important was Athens. It was one of the oldest cities of the world and the center for arts, science, architecture, politics, and philosophy. The medieval period was inspired by its culture. This was a place were great Philosophers came; Aristotle, Plato, and Socrates. All of these are essential elements that became a foundation of man's development.
Answer:
the first one lined up in rows
It should be the third choice
