Was there one Great Wall of China? Explain,

The Great Wall isn't a single wall at all, but a series of bulwarks and fortifications. The first went up some four centuries before Qin Shi Huang, who became China's first emperor in 221 BC, ordered a decade-long project to unite and expand these defences into a single barrier.

Explanation:

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The Great Wall isn't a single wall at all, but a series of bulwarks and fortifications. The first went up some four centuries before Qin Shi Huang, who became China's first emperor in 221 BC, ordered a decade-long project to unite and expand these defences into a single barrier.

Explanation:

the first one is d and the second a

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