Explanation and Answer:
A text writer can avoid plagiarism only in the case when he/she keeps records of all the sources to which he/she is referenced. If the author of the source that is used, does not stated, it is also a plagiarism. If sources that are similar to his or her own ideas are avoided and quotes from these sources are avoided, it can only contribute to gaining the impression that it tries to avoid plagiarism, on the contrary, it is necessary to quote similar sources as a confirmation of one's own attitude, with the consistent monitoring of its original and authentic idea.
Answer:
justinians plague: the plague killed 1/5th of the population of its imperial city
invading forces: The slavs attacked the Byzantium, so the Byzantines arranged for the avars to attack the slavs, which failed since it caused slavs to move further in the empire and the avars attacking the Byzantines
crusades: the Crusaders looted and destroyed parts of Constantinople
Ottomans: the Byzantine Ottoman wars led to the Byzantiums losing a lot of land and resources, even losing Constantinople by the hands of Sultān Mehmet Fatïh (Rahimullah)
Answer:
They both use clay models as a medium to preserve information. They both use available technology to draw accurate maps by hand. They both use two-dimensional images to represent physical features.