[Solved] Given two mutually exclusive projects and a zero cost of capital, the payback method and NPV method of selecting investments will always lead to the same decision on which project to undertake. Mammals: Warm-blooded vertebrate animals characterized by the presence of mammary glands which, in females, produce milk for feeding their young. Sexual Response Cycle: The series of psychological and physiological responses that comprise sexual arousal and activity, including stages such as excitement, plateau, orgasm, and resolution. Sexual Tension: Feelings of erotic desire or attraction toward another person, often accompanied by discomfort or unease due to unfulfilled desire. Genital Secretions: Fluids produced by the genital organs, which can play roles in reproduction, sexual attraction, and disease transmission.