Three buildings in the World Trade Center collapsed due to fire-induced structural failure. The South Tower collapsed at 9:59 a.m. after burning for 56 minutes in a fire caused by the impact of United Airlines Flight 175 and the explosion of its fuel.
The Mongol Empire lasted only 100 years.
The Mali Empire lasted a little more than 300 years.
<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be the having to do with the ease of building the reactors, since this is actually a very expensive difficult process. </span></span>
