Answer:
O The domesticated camel and the saddle
Explanation:
The trade with different cultures across the desert was one of the difficult trade carried out. This is because of non easier methods of transporting those goods across two different cultures.
In order to overcome this challenge, they have to make do with the use of beast of burden (animals) like camel upon which a carrier would be attached on for carrying the goods. The journey do take days before the goods would be delivered to the other country or culture.
