What is found in louisiana's salt marsh

What was the historic border between the united states and mexico?

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal

Which two sentences in this passage talk about china’s efforts to curb environmental degradation?