WILL GIVE BRAINLIEST!! Which of the following is correct?

a. North Africa relies on tourism.

b. North Africa has struggled with civil war.

c. North Africa is facing desertification.

d. All of the above

The idea of a progressive income tax, which is still a standard taxing policy in the u.s. today, was aggressively sought by the populist party. select the best answer from the choices provided true or false

The procedures for reporting potential unanticipated problems involving risk to subjects or others to the irb are: stated in the human subject protection regulations, but not in the drug or device regulationsincluded in the consent processdetermined by research staffdetermined by the institution in its written policies and procedures

Do you think the united states experiences amalgamation, assimilation, or pluralism? why?