Biofuels are emerging as an alternative energy source. they are made from renewable materials. all of the following materials can be used as a biofuel energy except

plant waste
animal waste
empty plastic milk jugs
farm crops

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.

answer; adjusting and adapting to a culture other than one's own;