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Do ants or other insects sleep, and if so why?
Interesting, a queen gets 9 hours of sleep, a worker only 4.5 hours...
Why did animals evolve genders?
The title is a bit misleading. Hermaphrodites still have genders, if you consider the reproduction system. The title looks more like that you ask for a reason for meiotic reproduction, as opposed to mitosis, which is an interesting question, too.