Who are the leaders of the uk's government and their roles

Explanation:

The Crown:Queen Elizabeth II, is the head of state of the United Kingdom.According to the uncodified constitution of the United Kingdom, the monarch has the following powers:Domestic powers

The power to dismiss and appoint a prime minister

The power to dismiss and appoint other ministers

The power to summon and prorogue Parliament

The power to grant or refuse Royal Assent to bills (making them valid and law)

The power to commission officers in the Armed Forces

The power to command the Armed Forces of the United Kingdom

The power to appoint members to the Queen's Counsel

The power to issue and withdraw passports

The power to grant prerogative of mercy (though capital punishment is abolished, this power is still used to change sentences)

The power to grant honours

The power to create corporations via Royal Charter

Foreign powers

The power to ratify and make treaties

The power to declare war and peace

The power to deploy the Armed Forces overseas

The power to recognize states

The power to credit and receive diplomats

Executive:Executive power in the United Kingdom is exercised by the Sovereign, Queen Elizabeth II, via Her Majesty's Government and the devolved national authorities - the Scottish Government, the Welsh Assembly Government and the Northern Ireland Executive.

The Prime Minister and the Cabinet

The Prime Minister is the most senior minister in the Cabinet. They are responsible for chairing Cabinet meetings, selecting Cabinet ministers

Government departments and the Civil Service

The Government of the United Kingdom contains a number of ministries known mainly, though not exclusively as departments, e.g., Department for Education. These are politically led by a Government Minister who is often a Secretary of State and member of the Cabinet.

early human migrations are the earliest migrations and expansions of archaic and modern humans across continents and are believed to have begun approximately 2 million years ago with the out of africa migration of homo erectus. this initial migration was followed by other archaic humans including h. heidelbergensis, which lived around 500,000 years ago and was the likely ancestor of both denisovans and neanderthals. early hominids were said to have "crossed land bridges that were eventually covered in water" .

within africa, homo sapiens dispersed around the time of its speciation, roughly 300,000 years ago.the "recent african origin" paradigm suggests that the anatomically modern humans outside of africa descend from a population of homo sapiens migrating from east africa roughly 70,000 years ago and spreading along the southern coast of asia and to oceania before 50,000 years ago. modern humans spread across europe about 40,000 years ago.

the migrating modern human populations are known to have interbred with local varieties of archaic humans, so that contemporary human populations are descended in small part (below 10% contribution) from regional varieties of archaic humans.

after the last glacial maximum, north eurasian populations migrated to the americas about 20,000 years ago. northern eurasia was peopled after 12,000 years ago, in the beginning holocene. arctic canada and greenland were reached by the paleo-eskimo expansion around 4,000 years ago. finally, polynesia was peopled after 2,000 years ago, by the austronesian expansion.

b.provides a written record of the transaction