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A common element among all the river valley civilizations was:

1. irrigation systems that moved water to crops and settlements
2. developed plumbing systems
3. developed written materials
4. the worship of leaders as gods

User Asjohnson
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1 Answer

1 vote

Answer:

1. because back in the day there was no toilets they had to dig holes

Step-by-step explanation:

User Kishan Busa
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