What new evidence gave experts new insights into the construction and use of mounds in the 1990s?
A. Newly discovered artifacts proved some mounds were built far earlier than experts once believed. Some were constructed well before local Indian cultures had highly organized governments B. Further investigation showed that mounds were actually garbage dumps where shells, artifacts, and food waste were covered with layers of dirt C. Calculating the labor required to construct mounds proved that slave laborers had been used for centuries to create the structures D. Careful placement of skulls and bones proved mounds were actually altars for religious sacrifices
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A.Newly discovered artifacts proved some mounds were built far earlier than experts once believed. Some were constructed well before local Indian cultures had highly organized governments
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