How did Sumer´s location in the Fertile Crescent allow the civilization to have specialized workers?

The availability of natural resources in abundant form.

Explanation:

Sumer´s location in the Fertile Crescent allow the civilization to have specialized workers because of the presence of resources which can be extracted when they have specialized worked which are trained in that specific field. There was a need for specialized worker in the Sumerians so that they take more benefits from the natural resources present at their location.

power       the answer is a

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that would be the steamboat because none of the other things are forms of transportation