Which of the following was a major change in politics during the progressive era?

Ineed because i cannot find the answers anywhere

According to the belmont report, the moral requirement that there be fair outcomes in the selection of research subjects, expresses the principle of: a. beneficence.b. respect for persons.c. justice.

In what ways did the compromise of 1850 and the kansas-nebraska act of 1854 differ from the missouri compromise? both compromises used the established 36°30′ parallel to determine if territories would become free or slave states. both compromises used the mason-dixon line to determine if the territories would become free or slave states. both compromises let territories use popular sovereignty to determine if they would become free or slave states. both compromises only granted congress the power to determine if territories would become free or slave states.