Respuesta :
The North American Mound Builders constructed earthen mounds; the mounds of the Ohio River valley served as graves, and other mounds served as temples, such as those in Illinois.
The answer is is the first one: They had expedient ways of burying their dead
I think, hope this helps. ^-^
Answer:
They covered their dead with enormous amounts of earth, either in houses or on high grounds near their villages.
Explanation: