George is experiencing back pain. his doctor tells him the bones attached to his spinal column have become less dense. the doctor is referring to the aging process the settling process the process of physical decline the decline in bone formation

it could be the lumbar vertebrae, or the sacrum

the organisms are not adapted to live in some communities or habitats.

you did not attach the discourse, but i assume it to be the discourse on the origin and basis of inequality among men (the original titile in french is: "discours sur l'origine et les fondements de l'inégalité parmi les hommes"), also know as "second discourse". in this discourse, jean-jacques rousseau emphasizes that private property is the basis of all inequalities.

therefore, what enabled the old regime to maintain as long as it did was private property.