They helped clear the respiratory system I think but I'm not entirely sure
As far as I am concerned Gao was not one of the Songhay Empire's major ones but I bet two answers should be acceptable in this question. I also think that you can include the third option from the scale represented above because <span>Algiers were quite far away on north so they couldn't be the part of the Songhay. </span>
The kingdom is famous for producing bronze statuary comparable to the best craftsmanship of the European Renaissance is Benin.
Sumerians would be the answer
