Through what means of transportation do scientists believe most human ancestors used to migrate from africa to other regions?

In at least two paragraphs, discuss the differences between the principles of republicanism and democracy. explain whether you think the united states is more of a republic or a democracy. refer to at least one example from the constitution.

The united states economy makes up how much of the worlds economy

The holocaust is associated with which conflict? question 9 options: world war i world war ii the cold war russian revolution