Two sounds waves will cancel each out if they are ______.
A. in phase by 180°
B. out of phase by 180°
C. in phase by 360°
D. out of phase by 360°
Answer: B
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Which invasive test can be used if blood tests and ultrasound have identified a potential problem with the developing child, or if there is a family history of inherited disorders?
A. amniocentesis B. chorionic villus sampling (CVS) C. ultrasound sonography D. first-trimester screen
Which of the following drugs is the first-line treatment for panic disorder and social anxiety?
a. antianxiety drugs b. anticonvulsants c. barbiturates d. SSRIs
The fetal period is marked by the appearance of ______.
A. bone B. muscle tissue C. the brain D. the indifferent gonad
Connor has Asperger's syndrome. His behavior is socially awkward, and the children in his classroom tend to react negatively to him because of it. In your text's discussion of developmental themes, the impact of Connor's awkwardness on his peers' response to him illustrates
a. a child passive in development. b. a child active in development. c. a child moving through continuous stages. d. a child moving through discontinuous stages.