Humans have built dams and levees on many of the world's rivers to control water flows. These structures ____.
A. cause major river deltas to sink
B. provide sediment to river deltas
C. increase wetland habitat
D. increase floodplain area
E. improve habitat for wetland species
Answer: A
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_____________________________________ is an organization created to defend western Europe against potential attacks from the Soviet Union.
Fill in the blank(s) with the appropriate word(s).
Which of the following IUPAC names is incorrect?
A) methylcyclohexane B) cis-1,4-dimethylcyclohexane C) cis-1,1,2-trimethylcyclohexane D) none, they are all correct
Estimates indicate the average annual background extinction rate is one species lost for each million species on the earth per year.
Answer the following statement true (T) or false (F)
The densest stars known to exist are ________
A) white dwarfs B) red dwarfs C) neutron stars D) black holes