Answer:
Mounds are very important so they were built:
Here are importance of mounds:
1. They are where dead was buried.
2. It was used as a place where ritual and sacrifice were held.
3. It was used as a platform for religious buildings.
4. This is a residence of priests and leaders.
5. It can be a defence for wars.
6. It can be a wind or storm breaker that helps lessen it's effects.
hope it helps
