[Solved] Research participants have been exposed to an incomplete stimulus followed by a masking image in order to assess A) crystallized intelligence. B) stereotype threat. C) perceptual speed. D) heritability. Successful Long-Term Relationships: Relationships that are thriving and enduring, marked by mutual understanding, respect, and love. Paternity Uncertainty: The impossibility for a male to be absolutely certain that he is the biological father of a child, due to the nature of internal fertilization and gestation in females. Extradyadic Sex: Sexual activity that occurs outside of a committed relationship, often considered a breach of exclusivity. Erotic Plasticity: The degree to which an individual's sex drive and sexual interests can change based on various social, environmental, and situational factors.