Between 6 and 7 million years ago, , the lineage that includes modern and closely related species from the lineage that led to . Hominins evolved thumbs that could touch other fingertips, enabling them to grasp objects and use tools. The skull, neck, spinal column, hip bones, and leg bones of early hominin species in ways that enabled later species to walk . As their brains increased in size, they developed complex social groups and became culturally advanced. They became excellent hunters and gatherers, controlled , built shelters, and buried their dead. Please help me, thank you :-)