All of the above would be the correct answer
Chang'an means of "<em>Perpetual Peace</em>" in traditional Chinese; and it can be described as an "<em>Everlasting Capital</em>" because it was persistently used as a capital again and again by many fresh Chinese rulers (<em>more than 10 dynasties</em>);
it can also be described as a <em>flourishing</em> cultural & <em>commercial center</em>; Chang'an has been one of the most important cities of the world.
Answer:
Nitrogen compounds mixed with hydrogen
Answer:
b
Explanation:
because there are 60 percent of 100
