How did homo habilis increasingly rely on cultural abilities?

Question

how are they tied to biological evidence preserved in the fossil record?

Answer 1

um .. hunting in a group is one thing

Answer 2

Habilis started to have a larger brain and was the first to be considered in the genus Homo.  Habilis is believed to use primitive tools.  The tools have been found associated with fossils.  There is some controversy as to whether H. habilis or rudolfensis were the real tool maker.  It is only biological evidence that is left in the fossil record, at least with regard to Habilis.  There are no cultural artifacts except tools.  By examining the tools and their wear marks and the teeth and miniscule fossil remains, you can make theories as to what their cultural abilities were.

Answer 3

They were known to have made and used tools -

opposable thumb

the sophistication of their tools indicates the level of communication

Erect posture, increased size of brain also indicates to an extent existence of some form of language and other cultural abilities.