Answer:
He had to find the right ingredient to make his filament burn slowly in the vacuum.
Answer:
9/11 attack on the twin towers by the Al-Qaeda terrorist.
Explanation: It effected many people since at least 3,000 people were killed.
<span>a war between citizens of the same country</span>
<span>They are descibed as: direct democracies, oligarchies
direct democracies, federations
indirect democracies, oligarchies
indirect democracies and federations</span>
