The XY sex-determination system is the sex-determination system found in humans, most other mammals, some insects (), some snakes, and some plants ().In this system, the sex of an individual is determined by a pair of sex chromosomes.
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xx is the 2009 debut album by English indie pop band the xx.After they signed a contract with XL Recordings, the band recorded the album from December 2008 to February 2009 at the label’s in-house studio in London.
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