In america, the terms "national government," "central government," and "federal government
a. are names for the three branches of government
b. correspond to the national, state, and local levels of government
c. are part of the system of checks and balances
d. are different names for the same government

depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.