Which of the following amines serve as a building block for the amine bases of DNA and RNA?
A) purine
B) pyrimidine
C) both a and b
D) neither a nor b
C
Environmental & Atmospheric Sciences
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Why are large areas of North America covered with immature soils characterized by weakly developed horizons?
What will be an ideal response?
Environmental & Atmospheric Sciences
Dunes that form in places where vegetation anchors some of the sand and therefore limits the sand supply are
A) parabolic dunes. B) barchan dunes. C) transverse dunes. D) linear dunes.
Environmental & Atmospheric Sciences
A typical rate of plate motion is
A. 1,000 kilometers per year B. 1-10 centimeters per year C. 3-4 meters per year D. 1 kilometer per year
Environmental & Atmospheric Sciences
A shallow saltwater body cut off from the ocean by a bay barrier is known as a
A) barrier spit. B) lagoon. C) tombolo. D) baymouth bar.
Environmental & Atmospheric Sciences