What helped make the Mars Science Laboratory mission successful? a
a lot of people working together for years
b
one person working by himself for decades
c
two countries competing with each other
d
hi-tech airbags first used in 2004

answer is d hi-tech airbags first used in 2004

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

b. the 200th birthday of the united states