Two-year-old Sammy uses the word "truck" only to refer to his dad's vehicle. This is an example of
A) referential style.
B) an overextension.
C) an underextension.
D) telegraphic speech.
C
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Indicate whether this statement is true or false.
In an experimental study, the ________ is manipulated to observe its effects on another variable
a. dependent variable b. independent variable c. correlation coefficient d. random assignment
Many people with depression smoke because:
a. It is a social event that makes them feel better b. Ingredients in tobacco act as monoamine oxidase inhibitors c. Nicotine increases their serotonin levels d. Addiction to nicotine is unlikely to occur in depressed smokers
A condition known commonly as "hardening of the arteries," in which artery walls become
thicker, harder, and less elastic, is ______. a. angina c. myocardial infarction b. atherosclerosis d. arteriosclerosis