Human Evolution Option D (IB Biology) Table of Contents: 00:00 - Human Evolution 00:12 - How do we know how old something is? 00:36 - Humans are primates 00:37 - How do we know how old something is? 03:33 - Humans are primates 04:44 - Hominid Fossil Trends 05:36 - Different diet Bigger brain? 06:01 - Summarize the main trends you see here: 07:52 - The fossil record is incomplete uncertainties