Later civilizations inherited several innovations from the ancient Egyptians, particularly in the areas of developments in mathematics and observations in astronomy. The Egyptians used geometry for land surveying and had a strong understanding of mathematics for building their monumental structures, which influenced later civilizations. They also made significant astronomical observations that contributed to calendar systems and navigation, which were important for subsequent cultures.
So, both developments in mathematics and observations in astronomy are valid responses regarding what later civilizations inherited from ancient Egyptian innovations.