Explain how ancient egypt was isolated from other culture by natural borders

On one side it had the Nile which was difficult to cross if the Egyptians didn't want people to cross it. On two sides there was a desert and one the north there was the sea. If Egypt wanted to isolate itself or be defensive in a war it had no problems doing so. It could easily restrict access of foreign cultures.

answer; /// charles darwin;

answer; protecting domestic national security; i believe this is correct,plz check first,good luck;