Within the field of psychology mental processes refer to

Mental processes, also known as "mental functions" , is a term often used interchangeably for all the things that individuals can do with their minds, including perception, memory, thinking, volition and emotion. Sometimes, the term "cognitive function" is used instead.

answer; i believe that the correct answer is (scientific approach)

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.