The ______________________________ assumes that efforts to prevent or reverse global warming will not succeed.

Wind moves sediment by:

A) bouncing sand grains along the surface
B) rolling sand grains along the surface
C) carrying finer material, like dust and silt, in air currents
D) all of these

In warm, shallow, marine environments, corals and other marine life typically construct:

A) reefs
B) stromatolites
C) tidal flats

Which of the following would exhibit primary succession? 

A)  an area recently flooded to create a reservoir 
B)  a forest that had been clear-cut 
C)  an abandoned farm 
D)  a rock exposed by a retreating glacier

_______________ species are those that normally live and thrive in a particular community.

Since 1950,most of the increase in global food production has come from increased yields per unit area of cropland in a process called the _________________________________.

Which letter in the diagram corresponds to phytoextraction?