Large covalently-bonded molecule that has a repeated structural unit

I believe the answer is: polymer

Polymer is consist of smaller repeated sub units. This substance could be found in our DNA structure and the synthetic plastics that we use for our shopping. In our body, polymer also play a role in the encoding the information that is necessary for protein creation.

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.