Since then the Great Wall was built, rebuilt to protect the northern borders of the Chinese Empire from the Hun's and Mongolian attacks during the rule of successive dynasties.
Answer:
The Russian word "tsar" is derived from the Latin title for the Roman emperors, caesar.
To be eligible to serve, you must be at least 25 years old, been a U.S citizen for the past seven years, and be an inhabitant of the state they represent (at election time).
The advantages when using nuclear fusion are the following:
1. We can have clean and non-polluted energy, no contribution of gases to the greenhouse effect or absorption of infrared radiation.
2. Effectively limitless fuel available
3. Very low cost of a fuel
4. No chain reaction
5. Fusion has the potential to provide abundant energy
I'm not sure, but I'd say either d or b, I'd ask a parent to look over it or email your teacher for help. (:
