Answer:
all of them are factors in the decline of Sumer
Explanation:
The fields of Sumer became saline due to which the harvesting and cultivation got poor.The yields from agriculture started to fall due to drainage problems which created drought and flood situations. Finally, the war situations intensively grew in the state that all together affected their population level.
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Why you give answer in question?
<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be the "steam engine", since these engines had no use in the development of the skyscrapers themselves. </span></span>