Name at least one important building in Tenochtitlan, and describe what
happened there?

One of the most important buildings in Tenochititlan is "The Great Temple." The Great Temple was "Topped by twin temples dedicated to the war god Huitzilopochtli and the rain god Tlaloc it was a focal point of the Aztec religion and very centre of the Aztec world."

not to sure sdi, strategic defense initiative

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.