Please answer question on Hominid diagnostics!!!

[gmicasa]

I was given six morphological correlates of the principle polythetic hominid diagnostics:

1. Erect Bipedalism
2. Manual dexterity: the emancipated hand-arm complex
3. Visual acuity and sensory reliance
4. Cpmparatively large and extremely complex cerebral cortex
5. Linguistic communication
6. Culture: learned, socially transmitted patterns of adaptive behavior

7. ____________???

I need the seventh one!!!
Can anyone help Please!!

[ndrthl]

It is very informative of the complexity of our human condition the very fact that there is no consensus on when modern humans (homo sapiens) came about. Theres a grey area here as well. A blurry grey area.