Exam 38: Human Influences on the Living World

Brown-air cities are so-called because:

As an alternative to fossil fuels,many countries (aside from the United States)are turning to ________________ as a way to provide energy.

Choose the one environmental problem that you feel is in need of our most immediate attention.Describe the problem and explain why you feel it is the one that is most urgent.

Widespread effects on the worldwide ecosystem are called __________________.

Water deep within underground aquifers is called ______________.

When populations become very small,their genetic diversity is increased.

The hole in the ozone layer is primarily due to:

Acid precipitation is so deadly because it:

Once a river is polluted,it is impossible for it to recover.