[Solved] Which of the following reflects a SMART goal? A) I want to live to see my grandchildren grow up. B) I want to be at my healthiest weight by my next doctor's appointment. C) I will eat only healthy foods. D) I will eat a healthy breakfast and run 3 miles every day. E) I will start running 2 miles every morning and then run a marathon next month. Erotic Plasticity: The degree to which an individual's sex drive and erotic responses can be shaped by cultural, social, and situational factors. Origins of Sexual Orientation: The factors contributing to a person's emotional, romantic, or sexual attraction to individuals of the same sex, opposite sex, or both. Testosterone Levels: The concentration of the hormone testosterone in the body, which can influence various physiological and behavioral functions. Identical Twins: Twins who develop from a single fertilized egg that splits and forms two embryos, sharing nearly all the same genetics.