A group of researchers was commissioned by the U.S. Department of Health and Human Services to examine data on the outcomes of Vietnam era soldiers who used heroin during their tours of duty in Vietnam
After reviewing the information, which of the following titles would be the most appropriate for their written report?
a) "Heroin: The downward slide is inevitable"
b) "Changed environments lead to changes in heroin use"
c) "Genetic predispositions to heroin cannot be overcome"
d) "Violence and heroin use: A legacy of the Vietnam era that will not go"
b
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Which of the following best characterizes Levallois tools?
a. They were simple tools, made from chipping larger stones. b. They were developed as hunting tools about 750,000 years ago. c. They were made from naturally occurring metal. d. They were broad, flat tools that could be used immediately after they were made.
Boys tend to play in ___________, whereas girls tend to play in
a. spurts; cycles. c. groups; pairs. b. pairs; groups. d. small groups; large networks.
There is an evolutionary basis for the development of stranger anxiety. Learning to stay close to familiar persons helps infants to ____
a. not be abducted by strangers b. not follow unfamiliar people so that they become lost c. be protected and safe d. learn object discrimination
A(n) ________ sample is one that has characteristics that are the same as the population it came from
FIll in the blank with correct word.