What is the best conclusion that can be drawn from this graph?

What is the meaning of the statement that all is vanity or meaningless? use full sentences

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

How does fortas defend the majority decision that free speech in school is constitutionally protected