[Solved] A mother's immune system may have a defensive response to substances produced by male fetuses. This is most likely to contribute to A) erotic plasticity. B) orgasmic disorder. C) sexually transmitted infections. D) the fraternal birth-order effect. Investments: Allocation of resources, such as time, money, or effort, with the expectation of achieving a future return or benefit. Close Relationships: Significant personal connections between individuals, characterized by emotional depth, commitment, and interdependence. Independence: The condition of being free from dependence, influence, or control by others, often associated with self-reliance. Trust: The firm belief in the reliability, truth, ability, or strength of someone or something, essential for social cohesion and cooperation.