At first it would be 10yrs, but as the Republic wore on, it increased to 16yrs, then 20yrs and then eventually 25yrs. However, not all gladiators were forced to do this service.
Answer:
To change the state/country or just to have a better impact of the world in the smallest way possible. They might also want to run to gain power or popularity.
C. A complete human skeleton
The launch of Sputnik into the Earth's orbit was the most clearly prompted choice that enabled the United States to pursue the Space Race.
