What are two ways in which simple villages became more complex

As of 2013, the world’s total population was about

1.3.3 quiz: primary and secondary sourcesquestion 4 of 102 pointsa secondary source is reliable and credible if the person who created thesource is an expert on the topic, is educated and respected in the field ofstudy, and:

Who is eric smith what did he do to derrick robie? did he stick a stick inside derrick robie?