What is the main purpose of the Bill of right

to protect the rights of U.S citizens (more info below)

Explanation:

The amendments, known as the Bill of Rights, were designed to protect the fundamental rights of U.S. citizens, to guarantee freedom of speech , of the press, of assembly and of the exercise of religion; the right to a fair legal procedure and to bear arms; and that powers not delegated to the federal government were reserved for States.

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the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.