Which of the following statements about body growth in adolescence is true?
A) The first outward sign of puberty is menarche for girls and spermarche for boys.
B) On average, the growth spurt is underway in North America around age 8 for girls and age 10 for boys.
C) In early adolescence, the typical girl is shorter and lighter than the typical boy.
D) Growth in body size is complete for most girls by age 16 and for boys by age 17½.
D
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A drawback in using primary punishers and primary reinforcers in research is that ________
a. they are not as effective as secondary reinforcers in conditioning procedures. b. using primary punishers or taking away a primary reinforcer is sometimes not ethical. c. the experimenter must first make sure that the stimulus has acquired reinforcing properties. d. they are more likely than other punishers and reinforcers to lead to superstitious behaviors.
The main destinations for messages from the retina are the ________ of the brain
a. limbic system b. parietal lobes c. motor control areas d. occipital lobes