[Solved] The substance that prevents the sacs at the ends of the bronchioles from collapsing is: A) atelectasis. B) mucus. C) cilia. D) surfactant. Erotic Plasticity: The degree to which an individual's sex drive, sexual preferences, and sexual identity can change throughout their lifetime. Evolutionary Psychology: A theoretical approach in psychology that explains human thoughts and behaviors in terms of natural selection and adaptation. Social Learning Theory: A theory that suggests people learn new behaviors through observational learning of the social factors in their environment. Handedness: Handedness refers to the preferential use of one hand over the other for performing tasks, influenced by genetic, biological, and environmental factors.