What is the main purpose of an argumentative essay?
a) to compare two different perspectives on an issue
b) to provide a detailed description of an event or idea
c) to discredit people who oppose your viewpoints
d) to make a point and back it up with evidence

Consider the events in alfred wegener's life that led to his development of the continental drift hypothesis. review the items below and determine whether each item is (1) an observation that led alfred wegener to develop his continental drift hypothesis, or (2) evidence wegener gathered to support his proposal.