A. Horizontal Integration
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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Italian city-states like Venice and Genoa were located on the trade routes that linked the rest of western Europe with the East. Both these city-states became bustling trading centers. ... The increase of trade led to a new kind of economy. During the middle ages people traded goods for other goods.
The answer is true because each of the photographs were one of a kind !
