Over time, usually many years. This is the correct answer.
I believe the answer is: Usman and Fodio
Both these scholars wrote hundreds of books for African people regarding, government, culture, religion, and social science.
These knowledge has been used for the past Three centuries after their arrival, by people in western africa as a foundation to built their islamic states.
Answer: The passage above is an example of a:
Semantic Encoding.
Explanation: Semantic Encoding is a form of storing details or information unlike the conventional way. It is processed on how the context is meaningfully related to another information or context or stimuli.
As it cannot be reversed
As it produces a lot of energy
A new substance is formed (glucose)