Which properties do not change the composition of substance

If there were no system of checks and balance,the process of government would eventually fall apart. do you agree with this opinion? why or why not?

The civilian conservation corps (ccc), an agency established during the great depression as part of the new deal, created jobs for people who were unemployed. what kind of work did people do as part of the ccc? a. built libraries and hospitals b. maintained state and national forests c. photographed migrants and the homeless d. constructed roads and bridges

How much time on average do americans currently spend watching tv and videos per day?