choose one answer choice What is the most important reason for treating excavation as a "last resort"? What is the most important reason for treating excavation as a "last resort"? governments and land-owners are increasingly reluctant to grant permission to excavate it's so much more expensive than other, non-excavation, techniques to gain information on a site the expense of storing all the recovered materials in perpetuity (=forever) is too great it's destructive, no matter how carefully the excavation is carried out