What was the "final straw" by the Germans that led to America declaring war on them in 1917?
ion
terroist attacks against American civilians
sinking the Lusitania
sending the Zimmerman Note
ng
bombing Pearl Harbor
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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