Answer:
A monopoly is a structure where a solitary provider delivers and sells a given item or administration. On the off chance that there is a solitary merchant in a specific market and there are no nearby substitutes for the item, at that point the market structure is that of an "pure monopoly".
Explanation:
B. Sails
The Egyptians were among the first to use sails on their ships to improve transportation.
D because both countries were right next to eachother tying to get more power than the other.
Balance mean an equal disturbution of weight