How did the Nile flood help life in ancient Egypt?

When the floods went down it left thick rich mud (black silt) which was excellent soil to plant seeds in after it had been ploughed.

The ancient Egyptians could grow crops only in the mud left behind when the Nile flooded. So they all had fields all along the River Nile. ... The Nile also gave the ancient Egyptians food.

byzantine empire is the answer i think you are looking for.

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geography

this is because warmer climates often don't get people sick from the flu and regions where it was often colder more people received the flu. hope this if you need more reasoning i am here to