Cumulative cultural evolution is best described as cultures evolve by continuously building on the accumulated skills and knowledge of prior generations.

• A. Cultures evolve by random drift with no cumulative knowledge
• B. Cultures evolve by continuously building on accumulated skills and knowledge of prior generations
• C. Cultures evolve through genetic inheritance
• D. Cultures remain static over time

Answer: (B)

Cumulative cultural evolution centers on how cultures become more complex because people learn from what previous generations created, pass those practices on, and continually refine them with new ideas. This ongoing process—social learning, imitation, and teaching—lets each generation build on the skills and knowledge that came before, a phenomenon often called ratcheting. That’s why the description stating that cultures evolve by continuously building on accumulated skills and knowledge of prior generations is the best fit. For example, improvements in tool technology, cooking techniques, or language arise because each generation learns successful methods, preserves them, and enhances them over time. The other descriptions don’t capture this mechanism: culture changing by random drift implies no directed accumulation; genetic inheritance would attribute cultural change to biological transmission rather than learned cultural practices; and cultures remaining static contradicts the observable long-term change in many societies.