Final answer:
One major contributing feature to Bramante's Tempietto is the incorporation of the steps Doric columns and the frieze, which illustrate the infusion of classical elements into Renaissance architecture.
Step-by-step explanation:
The Tempietto by Bramante is a key example of High Renaissance architecture that incorporates various historical architectural elements to create a harmonious and impactful design. One major contributing feature is the use of the steps Doric columns and the frieze.
These elements highlight the influence of classical antiquity on Renaissance architecture. The stepped columns are reminiscent of the Etruscan approach, with a high podium and strong frontality, while the frieze is more indicative of Greek influence, specifically the Doric frieze with its metopes and triglyphs.
Additionally, the central plan of the Tempietto, based on a circle, reflects the Renaissance fascination with geometric forms and their symbolic meanings, such as the perfection and eternal nature of God.