Life could be different after an ice age because the ice would melt and form large boundaries of water. The land would not be the same at all.
Sea level rise/construction of buildings. Both A and B are correct
Cairo is fan-shaped, narrowest in the south, where the river valley is wedged between desert escarpments, and widest in the north, where the valley blends into the delta. Over the centuries the city expanded westward, as a receding river channel left land flood-free. Lining the banks of the Nile River, Cairo is a fusion of ancient. Churches are built atop Roman ruins and skyscrapers rise behind medieval monuments. Egypt's capital is best known for preserving the last of the Seven Wonders of the Ancient World, but the city contains infinite treasures beyond the Pyramids of Giza.
Hope it helps
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A trapezoid is a type of quadrilateral that has an opposite pair of parallel sides; at lest, that definition seems pretty accurate to me.