In addition to conquest, which factor helped spread Islam?

Trade.

Explanation:

Trade was a big part in the spread of Islam and the merging of trade routes during the Golden Age of Islam created the ideal setting for cultural exchange, as merchants, nomads, religious pilgrims, and mercenaries were constantly coming into contact along these routes.

c

explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long  

answer; (true);