Final answer:
Kivas were circular, underground structures used for religious rituals by the Ancestral Puebloans. Anasazi shelters were multi-storied apartment-like buildings that provided housing and storage space.
Step-by-step explanation:
Kivas:
Kivas were circular, underground structures used by the Ancestral Puebloans for religious rituals and ceremonies. They were entered from the roof via a ladder and had a small hole in the floor called a sipapu, representing the place where ancestors emerged. Kivas often had fire pits, ventilation shafts, benches, and niches in the walls.
Anasazi Shelters:
The Ancestral Puebloans, also known as the Anasazi, built multi-storied apartment-like buildings as shelters. These structures, found in present-day Colorado, Utah, Arizona, and New Mexico, housed people and provided storage space for harvests. The kivas served as the ceremonial centers in these villages.