Teen mothers have twice the normal risk of:
a. dying during childbirth.
b. delivering a low-birth-weight baby.
c. contracting the AIDS virus.
d. spontaneous abortion.
B
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One of the main social forces that profoundly disturbs the earth's ecosystem is __________
A) the increase in human population B) the astronomical anomalies in the last decade C) the growing of food in greenhouses D) the decrease in economic growth
The United States burns just about __________ percent of the world's coal
A) 10 B) 50 C) 75 D) 25
A main complication in controlling international crime and terrorism is ________
A) cultural barriers that prevent international law enforcement agents from operating in foreign lands B) lack of funding from multiple governments C) there will always be bad people with no morals D) differing procedures and political agendas of different law enforcement agencies
Kenny performed an experiment on the effects of after-school educational activities on students' academic performance. His experimental group involved after-school educational activities and his control group involved after-school non-educational activities. The children in the control group felt left out and gave up on the experiment. Which source of internal invalidity is reflected?
a. instrumentation b. testing c. statistical regression d. demoralization e. history