Which of the following statements is correct?
A) Cytosine and thymine are both purines.
B) Cytosine and thymine are both pyrimidines.
C) Cytosine is a purine and thymine is a pyrimidine.
D) Cytosine is a pyrimidine and thymine is a purine.
B
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Some rural people are ____________________ to urban areas in search of a better life or ____________________ by poverty, famine, war or job insecurity.
Fill in the blank(s) with the appropriate word(s).
What is a common distinguishing characteristic of sedimentary rock masses?
a. They tend to be extremely hard. b. They are always very colorful. c. They are formed by solidification from a melt. d. They tend to be layered. e. all of the choices
The attractions of shopping malls include all but which of the following?
A) frequent concerts and exhibitions B) generous parking lots C) place to meet friends D) sheltered environments E) walking distance from homes
Subduction occurs at transform plate boundaries
a. True b. False Indicate whether the statement is true or false