The government it
titus
If you mean who was responsible for building the Colosseum, it was the Flavians. Vespasian began it in 72AD, Titus dedicated and opened it in 80, and Domitian added finishing touches to it sometime after 82. After the Flavians, the responsibility for maintenance was ultimately the emperor's, even though minor officials would oversee the day to day upkeep.
YOU (each and every one of us) is responsible for making good decisions, and protecting YOURSELF.
no one
No. The ovaries produce eggs cells. The uterus is responsible for protecting and nourishing the fetus.
The crust is responsible for holding in and protecting the contents of a pie while it is being baked.
The Environmental Protection Agency (EPA) is primarily responsible for protecting the environment from contamination by hazardous materials.
federal
DoD military, civilians, and contractors
security management
The Congress
The USB memory card reader can be responsible for write protecting the SD memory cards through its Lock switch.
The nuclear membrane surrounds the nucleus and protects it.