?The heritability of attention deficit/hyperactivity disorder (ADHD) is
a. less than 10 percent
b. between 20 and 40 percent.
c. between 40 and 60 percent.
d. 70 percent or higher.
Answer: d. 70 percent or higher.
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Overactivity of which endocrine gland or brain structure leads to tenseness, nervousness, and excitability?
a. pineal gland b. thyroid gland c. hippocampus d. cerebellum
Hue, brightness, and saturation are all physical properties of the visual stimulus, light
Indicate whether this statement is true or false.
Which of the following factors influences the rates of MZ twinning?
A) ethnicity B) a history of MZ twins on the mother's side of the family C) maternal age D) The rate of MZ twins is virtually the same in all segments of the population.
What proportion of marriages in the United States remain intact?
a) 1/4 b) 1/3 c) 1/2 d) 3/4