Researchers Have Discovered a Possible Biological Basis for Sexual Orientation

question 22

Multiple Choice

Researchers have discovered a possible biological basis for sexual orientation that has become known as "the older brother effect," meaning ________.

• A) as the number of older brothers a man has decreases, his chances of being gay increases
• B) as the number of older brothers a woman has increases, so do her chances of being lesbian
• C) as the number of older brothers a man has increases, so do his chances of being gay
• D) the oldest brother is more likely to be gay

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