How does the actions of Czar Nicholas and food shortages lead to protests and Revolution?

What is political gerrymandering, what does is accomplish, and why might legislators use this tactic in redistricting

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

Brainliesttt asap!me : describe the responses to terrorism in the united states.