Final answer:
Mississippian period Indians' belief in an afterlife is suggested by their elaborate burial ceremonies and the construction of burial mounds that also served as worship centers.
Step-by-step explanation:
It can be inferred that Mississippian period Indians believed in an afterlife because they practiced elaborate burial ceremonies and built cemeteries. The Mississippians were known for their moundbuilding, which included burial mounds for the elite, and these mounds served not only as burial sites but also as centers for worship. Large-scale, corn-based agriculture supported a dense population and led to the emergence of the Mississippian culture, which allowed for specialization and elaborate cultural practices related to death and the afterlife.