Cuneiform was used in .

Astronomical Text

Explanation:

Cuneiform is a special system of writing used by the "Somerians". They were first used from 3500-3000 BCE.

c, they united with once

the answer is b: the religion they practice.

here's why:

there were many different native american tribes and those with similar characteristics formed a main tribe or nation. each had its own language, religion and customs.