How did canals and railroads transform trade in the Midwest?

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

Afeature that an organism __ and reproduce in its environment is called a

Who was william jennings bryan? what platform did he run on?