Why are there so few structures still surviving from ancient Mesopotamia?

Question

(2 points)
Responses

All of the structures from this time period were made from clay bricks, and natural erosion has worn most of the small buildings away.
All of the structures from this time period were made from clay bricks, and natural erosion has worn most of the small buildings away.
Many ruins have long served as quarries for building materials.
Many ruins have long served as quarries for building materials.
Wars and pillaging of artifacts contribute to the lack of surviving structures.
Wars and pillaging of artifacts contribute to the lack of surviving structures.
all of the above

Answer 1

All of the above.

Each of the points listed contributes to the limited survival of ancient Mesopotamian structures. The use of clay bricks, natural erosion, the repurposing of ruins as quarries, and historical wars and pillaging have all played significant roles in the degradation and loss of these ancient buildings.