Egypt began weakening under a series of invasions beginning in 1000 BCE, but it began its serious decline after being invaded by whom in 331 BCE?

the answer. is b

hope this : d

north east because it has more forest

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

hope this .

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abraham lincoln