Which would be most responsible for the transfer of islamic science extension of credit and chinese printing methods that took place in the 13th and 14th centuries

Pax Mongolica or Pax Tatarica was responsible for the transfer of Islamic science extension of credit and Chinese printing methods that occurred in the 13tha d 14th centuries. During Pax Mongolica, the banking system was developed and credit extension was very common. Islamic methods of mathematics, astronomy and science also became common in some continents during the Pax Mongolica. Methods of printing also made their way from China to Europe. 

chlorofluorocarbons are released via: aerosol sprays and refrigerants.

presidency should be the title