It is unlikely that we will be able to detect the signals from civilizations in other galaxies because a) signals from other galaxies will be severely weakened by distance, making them far harder for us to detect b) other galaxies are unlikely to harbor intelligent civilizations c) they will most likely transmit at wavelengths that will be absorbed by intergalactic gas d) signals from civilizations on other galaxies will not reach us before we give up listening

C

Explanation:

As much as we want to, we cant underestimate potetnial life on other planets. So this all deals with communication. If there is life in other galaxies, it will take years to get responses, and even the wavelengths will be absorbed.

yes, since there is a positive and a negetive if the positive and negitive wasn't there wouldn't a flow electricity in it.

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.