Opposite sex fraternal twins

Slavery in Great Britain existed prior to the Roman occupation and until the 12th century, when chattel slavery disappeared, at least for a time, following the Norman Conquest. Former indigenous slaves merged into the larger body of serfs in Britain and no longer were recognised separately in law or custom. Historically, Britons were enslaved in large numbers, typically by rich merchants and warlords who exported indigenous slaves from pre-Roman times [3] and by foreign invaders from the Roman Empire during the Roman Conquest of Britain. A thousand years later, British merchants became major participants in the Atlantic slave trade in the early modern period. Then wealthy people living within the British Isles, as well as in British colonies, might own African slaves. In a triangular trade -system, ship-owners transported enslaved West Africans to the New World especially to the Caribbean to be sold there.

Twins are two offspring produced by the same pregnancy. In contrast, a fetus that develops alone in the womb the much more common case, in humans is called a singleton , and the general term for one offspring of a multiple birth is a multiple. North America and Europe have intermediate rates of 9 to 16 twin sets per 1, live births. Multiple pregnancies are much less likely to carry to full term than single births, with twin pregnancies lasting on average 37 weeks, three weeks less than full term. There is no known genetic link for identical twinning. The vast majority of twins are either dizygotic fraternal or monozygotic identical.

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