Over the past 50 years in the United States, the populations of
A) suburbs have increased, while rural regions and city centers have declined.
B) suburbs and rural regions have increased, while city centers have declined.
C) city centers have increased, while suburbs and rural regions have declined.
D) city centers and rural regions have increased, while suburbs have declined.
Question 2
The soil structure resulting from the castings of earthworms
A) improves the infiltration and aeration of soil.
B) decreases the infiltration and aeration of soil.
C) decreases the nutrient-holding capacity of soil.
D) improves the nutrient-holding capacity but decreases the aeration of soil.
Feral pigs in the United States (here Cape Canaveral, Florida)
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