The region with the greatest number of urban areas vulnerable to sea level rise is
A) Europe.
B) South America.
C) Australia.
D) Africa.
E) Southeast Asia.
Question 2
Desertification occurring in the grasslands of the Sahel, bordering the Sahara, is the result of
A) careless overgrazing by local herders.
B) expanding beef production for U.S. and European markets.
C) a complex set of environmental, cultural and political economic factors.
D) industrialization and urbanization.
E) droughts and other acts of nature or God.
An H II Region
Estimated Number of New Sexually Transmitted Infections
Pneumonia patient’s chest x-ray. Note the irregular areas of density.
Ice Age Sea Level
Relationship between the number of amino acid substitutions
Number line (real numbers)