No, cats can help rid of the rats that cause the black plaque.
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The change in Helen's work hours (night shift) may cause Helen to be at increased risk for heart disease. The effects of shift work can manifest in various forms of illness, one is problems in the cardiovascular system. The reason is because the cardiovascular system in all mammals is highly organised with regard to time and when the time is different organized (the time we should sleep we work) that can lead to certain conditions.
The correct statement here is
(2). Over time, the Arab Empire expanded and conquered Byzantine territories in the Middle East and northern Africa
Explanation:
At the time of the bifurcation and eventual fall of the original Roman empire with its fragmentation, the holy Roman empire up west was the empire that was its successor in a sense while the empire that emerged to the east was of the Byzantines who were ruling from Iran.
Their power would be challenged by the caliphate after the formulation of Islam as they would eventually take over all the territory of the Byzantines and force the empire into near submission.