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

Question 16 of 27 1 point which statement best describes the mid-atlantic colonies of pennsylvania and new york? o a. policies of religious freedom attracted a diverse range of settlers. o b. they developed an economy based around slave labor. o c. nearly all of their settlers came from the same religious background. o d. conditions in these colonies were not well suited for small farmers