Answer:the correct answer is it performs all functions
Explanation: i just did a quiz and got it right
oases due to lack of arable soil.
b) In parts of West Africa they are careful not to cut down trees to make arable
land.
c) c. Tension exists in Egypt between secularism and Catholicism.
d) d. Arabic is the language that unifies most of northern Africa.
e) e. Unemployment is a serious economic problem in North Africa.
f) f. In the AD 600s, North Africa was conquered by Arab Muslims.
g) g. Egypt contributes to the culture of North Africa by producing many popular
books, films, and television shows in Greek.
h) h. Lack of stable governments is a major obstacle to development in some African
nations.
Answer:They help ensure that changes in the independent variable are affecting the dependent variable.
Explanation:E2022
John James Marshall was an American lawyer, judge, politician, diplomat, legislator, statesman, jurist and military. He served as the fourth Chief Justice of the United States from 1801 to 1835 and also served as the United States Secretary of State.
When Marshall was Chief Justice, he helped shaping the American judicial system, specially with the rights of the citizens, he also expanded the Court's jurisdiction to make it an integral part of the federal system of checks and balances, before that the Court didn't have substantial authority. He gave the Supreme Court authority over every legislature and court in the nation and gave power to throw out laws that contradicted the constitution. That way the Judicial, Executive and Legislative Branches were equals.