There are two basic kinds of organisms â ones with a nucleus and those without a nucleus (a compartment filled with DNA surrounded by a membrane called a nuclear envelope): Prokaryotes: Organisms whose cells lack a nucleus and therefore have DNA floating loosely in the liquid center of the cell. Prokaryotes divide, and thus reproduce, by simple mitosis. Eukaryotes: Organisms that have a well-defined nucleus to house and protect the DNA. Eukaryotes divide by meiosis for sexual reproduction.
UPDATE ONE: Overwatch is set to launch live in the UK at midnight on May 24, just two hours away. North America sees a slightly different release slot, due to the game being launched around the globe at roughly the same time, players in LA will see Overwatch arrive on May 23, at 4pm.
Overwatch was unveiled at BlizzCon 2014 in a fully playable state, and was in a closed beta from late 2015 through early 2016. An open beta in May 2016 drew in more than 9.7 million players. The release of the game was promoted with short animated videos to introduce the game's narrative and each of the characters.