What is one likely explanation for why puberty starts earlier now than it did long ago?
a. Increased weight gain has led to higher levels of the hormone leptin
b. An increased percentage of mothers today have a college education.
c. Teenage sexual activity has become more common and more accepted.
d. Natural selection has favored genes that cause early onset of puberty.
a
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Once information is taken in, it is held in a memory facility where it can either be both stored or actively used to help solve problems. This facility is called ____ memory
a. eidetic b. working c. iconic d. echoic
A friend stated that when she went to a clinic, she had to spend 30- to 60-second sessions shaking her head from side to side, spinning in a chair, tensing all her muscles, hyperventilating, or breathing through a narrow straw. She is most likely receiving treatment for a. specific phobia
b. social phobia. c. panic disorder. d. posttraumatic stress disorder.
A dilemma of experimental research is that research designs that produce high internal validity may have problems with ____
a. random variables b. external validity c. confounding variables d. reliability
Suppose that a feral (wild) child were rescued from the wild. Its skeletal age could be judged by x-raying its
a. ears. b. chin. c. wrist and hand. d. knee.