Do anyone know this ?

How does the battle of midway illustrate the importance of intelligence gathering and espionage in modern warfare?

Which of these were effects of mass production techniques used during 1920s

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