The toumai fossil is estimated to be
a. between 5.2 million and 7 million years old
b. between 3.5 million and 4 million years old
c. approximately 9 million years old
d. approximately 8 million years old

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.