What challenges did the geographical features of the Canal Zone present in building the canal? How were those challenges overcome?

They built new paved roads so that a greater number of dump trucks could remove the excavated earth. They sprayed insecticides to kill mosquitoes and built concrete locks to raise ships to a higher elevation.

Explanation:

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).