What type of structure is identified as a religious and defensive construction on hills in ancient Greece?

The type of structure identified as a religious and defensive construction on hills in ancient Greece is the acropolis. The acropolis served as a citadel, typically situated on elevated ground, providing a strategic advantage for defense. In addition to its military function, it was also a sacred space in many city-states, dedicated to important deities. The prominent temples and public buildings constructed on the acropolis, such as the Parthenon, highlight its dual role as both a place of worship and a defensive stronghold.

The choice of acropolis as the answer emphasizes its historical significance in ancient Greek architecture and society, where it represented not just physical security but also the cultural and religious ideals of the time. Its elevated position symbolizes the importance of religion and civic pride in Greek urban planning.