What do you think is the most important sign of early civilization?

kudriavtseva

yesenia.ortiz

tseibert

aorantes

3ho.jason

ms.shellie.harris

marcela.cerda

xochitl.zuniga

doconnor

wolfej

luke.kearns

danielle.rochester

JHieber

brooke.johnson

kjenkins

sagadatzeynep

rosie.fluegel

lois.moon

jjohnson