The main reason for the wall's construction had always been defense. Since China's first dynasty, the empire faced a near-constant threat of attack from the nomadic tribes to the north. This included those famed Mongols as well as lesser-known groups like the Xiongnu and the Göktürks.
The energy transfer of one organism to the next? when a organism is eaten a certain percent of their meals energy is gain for example a snake eats a mouse only a small percent of that mouse's energy is past to the snake i hope this helps
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Roosevelt choose to use such emotional language in the four freedoms speech because he needed to appeal the people's emotions to make them feel something so that they'd listen to him.
