In some species of reptiles, including alligators, sex is determined by the temperature at which the egg is incubated. Other species, such as some snails, practise sex change: adults start out male, then become female. In tropical clown fish, the dominant individual in a group becomes female while the other ones are male. In some arthropods, sex is determined by infection. Bacteria of the genus Wolbachia alter their sexuality; some species consist entirely of ZZ individuals, with sex determined by the presence of Wolbachia.

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A swistak siedzi bo se siedzi
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Ja mam 20 lat, Ty masz 20 lat, a swistak dorzywocie!

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The Americas, also known as America, are the lands of the western hemisphere, composed of numerous entities and regions variably defined by geography, politics, and culture. The Americas are frequently reckoned to comprise two separate continents (North America and South America), especially in English-speaking nations. The Americas may also be reckoned to comprise a single continent (named America), particularly in Latin America and in some European nations.[1