During which eon did oxygen begin to build up the most in Earth’s atmosphere?
A) Proterozoic
B) Archean
C) Hadean
D) Phanerozoic

The five tribe’s economy shifted in many ways, which of the following changes is not an example of how they assimilated? a. many tribes began to herd animals and build plantations. b. tribes began to use bartering to trade with others. c. at stores and trading posts, tribes used us currency to trade. d. women began to focus on weaving and spinning to make cloth.

What is the liberal pov on social issues

What is significant about official languages in russian republics? why would it matter?