Fill in the blanks :
1. Some scientists believe that the Neanderthals communicated with each other by producing ……… and other primary sounds.
2. Neanderthals had established some ………… of burying the dead.
3. Some groups of Neanderthals left …………………. and migrated up to the continents of Europe and Asia.
4. They had to …………. new ways of living and finding food.
5. ………………… is the name used for humans that were more advanced than the Neanderthals.