Create an account
a group of people having similar backgrounds, incomes (how much money someone makes) and ways of living
a society that has cities, essential government run byofficial leaders and workers who specialize in various jobs
a modern human or a member of an earlier group that may have included ancestors or relatives of modern humans
a period of time during whitch hodminids made lasting tools and weapons mainly from stone. The earliest known period of prehistoric culture
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together