The three age system is useful for the study of

chronology

the three age are stone age bronze age and iron age.

artifacts and events of late prehistory and early history could be ordered into a chronology.

the answer is ancient European cultures

Explanation:

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i'm not so sure but i hope this in anyway.

the president of russia is head of state, and of a multi-party system with executive power exercised by the government, headed by the prime minister, who is appointed by the president with the parliament's approval.

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c. archbishop desmond tutu promoted the acknowledgement of the rights of black africans and expose human rights abuses.

d. leader haile selassie modernized african society through the institution of progressive social, economic, and educational reforms.