Final answer:
The church of Santa Sabina includes an apse, which is a semicircular or polygonal termination to the choir or sanctuary and is one of the key architectural elements found in its structure.
Step-by-step explanation:
The architectural element found in the church of Santa Sabina is the apse. Santa Sabina, which is a classic example of an early Christian basilica, was constructed during the 4th or 5th century and retains the cruciform shape characteristic of many Christian churches of the time. This design includes a central nave with one aisle on each side, and an apse, which is the semicircular or polygonal termination to the choir or sanctuary. Priests conducted liturgical ceremonies from the apse of the church, which was considered a sacred area. In the layout of Santa Sabina, there is no mention of a crypt; however, it does include a narthex, transept, and most notably, the apse.