Though not entirely conclusive at this point, research by Simon LeVay and others have demonstrated that homosexuality may be linked with a smaller _____ in the brain

Opposites attract." "Birds of a feather flock together." These aphorisms are:

a) theories b) hypotheses c) variables d) operational definitions

Which of the following symptom(s) is(are) common to each of the anxiety disorders

described in the text? a. Fear reactions that occur without warning and therefore cannot be anticipated. b. Flashbacks or nightmares about the feared object. c. Avoidant behaviors and excessive worries. d. Marked and persistent fear that interferes with normal routine and/or daily functioning. e. All of the above symptoms are common to each of the anxiety disorders described in the chapter.