Calculate the rates off radioactive decay if the following percentages of radioactive material is found in fossils or rocks
1. C14 at 65%
2. C14 at 15%
3. K40 at 30%
4. K40 at 15%

The country in the world with the largest population is_?

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.

In saudi arabia, voting rights are limited to