What 5 techniques do historians and scientist use to date artifacts from prehistory

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

i think the answer is the one about environmental and social health.

hope this

i would say the executive branch is because the executive branch is in charge of enforcing the laws and judicial branch is in charge of enforcing but the executive branch is most responsible for it all so i would have to say the executive branch.