Which factor contributed to the collapse of both the Roman Empire and the Han dynasty

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

Use the image to answer the question, rid egypt what do the structures in this photograph suggest about ancient egypt?

The committee of correspondence: a)directed colonial militias b)organized boycotts of british goods. c) raised funds for colonial legislatures d) spoke with foreign governments.