Henri becquerel and the curies worked with uranium, radium, and polonium, all of which give off sunlight radiation elements light

Henri Becquerel and the Curies worked with uranium, radium, and polonium, all of which give off radiation.

Explanation:

Henri Becquerel and Marie Skłodowska-Curie discovered the process of radioactivity. They were awarded Nobel prize for their work. Radioactivity is the process in which an unstable element emits energy in the form of radiation. This process also produce a lot of heat. Radiations are very harmful for human health however they have wide applications in modern technology.  

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.

the dark variety, as they are not visible on the dark tree barks

explanation: