I am pretty confident that the shelters were made from wood and bones. However, I could be wrong, so try to find another source. I hope that my "answer" was useful!
<span>The advantages of culturally diverse groups appear to include the generation of more and better ideas while limiting the risk of
"Groupthink".
</span>
Groupthink refers to the
trend when the willingness to <span>group consensus supersedes
individual’s general ability of presenting alternatives etc.</span>
<span> </span>
