benedict's solution contains copper(2) sulphate (blue). the copper (2) salt can be reduced to a red precipitate of copper (1) oxide by a reducing agent. some sugars have this reducing property

I don't know

Explanation:

But I know

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

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.