This lesson is made to be a stand-alone lesson where students can answer all of the questions by looking at the diagram. I have included Lucy and "Ardi" who is the most recently found early human. Students look at the time-line, drawings, etc. to answer the questions. This worksheet can be a make-up assignment for absences, a homework assignment, in-class assignment, etc. No lecture is needed before hand. I showed a video on human evolution before I gave my students this worksheet.