As farming became more productive for river valley civilizations, farms were moved into river deltas and developed techniques and tools to increase production. All of the following were part of this later development EXCEPT ●irrigation
● plows
● terracing
●wheels

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The terracing was not part of this later development in farming.

Explanation:

A is not correct because by farming in the deltas, the humans were able to bring easily water to their crops whenever it was needed, unlike before that when they relied on the flood.

B is not correct because the plows were an innovation that was heavily used in the deltas and generally in the low and flat plains.

C is correct because the terracing was practiced only at places where the topography was problematic, or rather the terrain was very steep, so it was in no way found in the deltas.

D is not correct because the wheels were used a lot in the deltas where there was farming, as they enabled easier working on the farms, but also easier transportation of the goods.

a

explanation:

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