Islamic slave traders in african slaves to blank during the period from the 900s to the 1400s

Which type of learning occurs when you observe how other people act?

The state fire marshal ensures a program can legally operate in a specific location and has sound structure?

Science cannot describe things that a.) are beyond imagination, experience, or human ability b.) cannot be observed, measured, or tested c.) have not been conclusively proven d.) occur without being seen, heard, or felt