Why do scientists believe the discovery of the Clovis spear points in Washington is significant? A. They are the only evidence of ancient humans in the Pacific Northwest
OB. They prove that ancient farmers were also great hunters.
OC. They show that ancient hunters used metal weapons to hunt mastodons.
OD. They support the claim that humans lived in the area at the end of the last ice age.

b is the answer i am assuming

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.

answer: in 1900, there were no "workplace safety laws"!

explanation: at the beginning of this century, workers in the united states faced remarkably high health and safety risks on the job.

a century ago in 1900 about three hundred out of every one hundred thousand miners were killed on the job each year.

[industria] developments occurred within a legal and regulatory climate that diminished employer’s interest in safety. as a result, americans developed production methods that were both highly productive and often very dangerous.