Were the Sephardi Jews a homogenous group or a heterogeneous group?

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.

Fertility and mortality rates are higher in more developed nations.

What are the 28 countries in the eu?