The answer is:
Because of the presence of FRESHWATER in the NILE RIVERBANK.
What is freshwater?
Freshwater is found in glaciers, lakes, reservoirs, ponds, rivers, streams, wetlands, and even groundwater. those freshwater habitats are less than 1% of the world's total floor region but house 10% of all recognized animals and as much as 40% of all recognized fish species.
They have a low salt concentration — usually less than 1%. Plants and animals in freshwater regions are adjusted to the low salt content and would not be able to survive in areas of high salt concentration.
Learn more about the importance of the NILE River here: https://brainly.com/question/8318272
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