Final answer:
The latency stage in Freud's psychosexual development theory is the longest stage that ensures the continuation of the human species.
Explanation:
The longest stage of psychosexual development according to Freud that ensures continuation of the human species is the latency stage. This stage occurs from around 6 years of age until puberty when sexual feelings are dormant as children focus on other aspects of development, such as school, friendships, and hobbies. It acts as a bridge between the earlier stages and the final stage, the genital stage, where individuals are capable of mature reproductive functioning.
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