How could shifts in the the physical environment have caused major changes in early civilizations

Iwill be giving 15 points to whoever answers the concept of checks and balances means that each branch of governmenta. has its own powers and responsibilitiesb. is clearly described in articles of the constitutionc. has the ability to correct the other branches in case of an errord. is set up so that in case of constitutional crisis, the governement will continue to operate

What does the author most likely say the time for negotiating with britain was over

Why does reagan claim the united states needs a strong defense policy?