| Chapter Outline
This chapter addresses the following questions:
- What changes emerge in the fossil record beginning about 2.7 million years ago?
- Who were the robust hominins, and how were they different from other Plio-Pleistocene hominin forms?
- Who are the two gracile hominins? Are they related to later forms?
- What major changes happened in the human lineage about 2 million years ago, and how did humans of this time period live?
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