What tree was used in acuna-soto research

True or false colonies were first established by greece around 700 bc to supply food

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 directive in source a might have been at the root of the action described in source b?