Help me!
West Africans helped their economy by mining gold and what??

In which research method does a researcher change the value of one variable to determine how the change affects another variable? a. experiment b. observational research c. survey d. case study

What refers to the existence of more than one level of government in the country

Plz i need i really don’t want to fail i’m only 14. can somebody write a rough draft for me. about how tighter british control led to a revolution in colonial america has to be at least 4 paragraphs plz me passing depends on this plz