[Solved] Which center is located in the pons? A) inspiratory center B) pacemaker neuron center C) pontine respirator group (PRG) D) expiratory center Partner's Physical Attractiveness: The degree to which one finds their romantic partner's appearance to be appealing, which can influence relationship satisfaction and dynamics. Fraternal Birth-Order Effect: A phenomenon related to sexual orientation, suggesting that a male's likelihood of being homosexual increases with the number of older brothers he has. Maternal Immune Response: The reaction of a mother's immune system to foreign substances, which can affect pregnancy, fetal development, and the health of the newborn. Erotic Plasticity: The degree to which one's sex drive or sexual preferences can be influenced by environmental, situational, or cultural factors.