During which eon did invertebrates begin to populate the earth?
a. amebic eon
b. archeaon eon
c. phanerozoic eon
d. proterozoic eon

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

This map shows the member states of the european union (eu). based on this map, what is the most likely reason the eu was formed? a) to increase trade between european nations b) to protect themselves from foreign enemies c) to begin the process of forming one large nation d) to isolate europe from the rest of the international community j

The english language is part of which language family? a. alatic b. dravidan c. indo-european d. khoisan