4. how does article i, section 6 of the constitution protect members of congress?
o protects free speech for congressional debates
o allows members of congress to receive salary raises
o allows members of congress to mail letters for free
o protects members of congress when voting on a bill

Protects free speech for congressional debates.

Explanation:

United States Contitution, Article I, Section 6 "Speech or Debate Clause", clearly states that the members of the both Houses of Congress will be protected from getting arrested during their attendance, for any speech or debate. This exists so it can protect the members of the Congress from getting arrested and prevent them from voting or take actions for which the President might disagree. Treason, Felony and Breach of Peace are not included in this protection. This is also called an immunity.  

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.

there are more than a million jobs out there

explanation:

they pay you money for doing work