Laughter first appears around
A) 3 to 4 weeks.
B) 6 to 8 weeks.
C) 3 to 4 months.
D) 6 to 8 months.
C
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Although gay, lesbian, and bisexual youths may not need contraception for birth control purposes, they do need it _____
a. for protection from STIs b. to assess their sexual attitudes c. to limit harmful psychological effects of sexual activity d. to limit harmful physical effects of sexual activity
A green square surrounded by red looks more green than if surrounded by a neutral color. Similarly, a yellow square looks more yellow when surrounded by a blue background than a neutral background. These phenomena support which view of color perception?
A. competitive theory of color vision B. trichromatic theory of color vision C. complementary theory of color vision D. opponent-process theory of color vision