Hi, Welcome to Spiral, free apps for collaborative learning. You can launch this free activity from here.

4. When Humans Were Scarce

By Mark Ashworth 29 Sep 15:16
hunter gatherer agriculturalist fertility mortality Onan Cisalpine Gaul Kung exogamy lactational amenorrhea birth interval Hutterites Display all tags
1 slide
Spiral is being used in 142 countries and counting. See what teachers are saying. View more
Sorry, your browser does not support inline SVG.