How did growth of trade during the song dynasty affect china
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The correct answer is a. when they started making tools that will them in cultivating lands, they could raise crops and that made them attached to one place for a longer period of time. after that, they started domesticating animals and building their own permanent settlements that resemble the ones we have today.

S^2 = a4^2 = a4 * 4 = a16 centimeters = area of the square