What signifies the period known as prehistory?
a.
language was fully evolved.
b.
writing was very elementary.
c.
there was no form of writing.
d.
records were hidden away.

Which statement best describes a significant cause of world war ii? o a. the economic boom that followed world war i allowed countries to build up huge militaries. o b. the treaty of versailles, which ended world war i, left lasting resentments in many countries. o c. the rise of imperial states in asia caused european powers to unite for their common defense. o d. the league of nations encouraged european states to form secret military alliances.