Why is fiber essential in a healthy diet?
A) It contains essential amino acids.
B) It contains essential fatty acids.
C) It is necessary for proper functioning of the digestive system.
D) All of the above are correct.
C
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What technology made suburbs possible?
A) automobiles B) highways C) telephones D) electrical energy E) all of the above
Between 1981 and 2009 in the United States, the annual average of fire deaths ________ and the annual average economic damage to structures due to fires ________.
A. decreased; increased B. decreased; decreased C. increased; increased D. remained flat; decreased slightly E. increased; decreased
The main source of the dissolved load in a stream is ________
A) material along the sides of the stream channel B) material along the bottom of the stream channel C) groundwater D) cut bank soil E) salt flats
When sand lithifies, the resulting rock is commonly called ________
A) conglomerate B) breccia C) shale D) sandstone