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It seems sexual reproduction is ubiquitous in eukaryotes, so it is important despite needing excessive resources spent. It is an evolutionary adaptation for better evolution.

Still, there are species that had lost their ability to reproduce sexually. I wonder how far a species can evolve after losing the ability. Are there any species that really innovated after they lost sexual reproduction?

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    $\begingroup$ "Sexual reproduction is ubiquitous in eukaryotes" and "there are species that [have] lost their ability to reproduce sexually" are mutually exclusive. You can't have them both at the same time. Please give some examples of species that have lost their abilities to sexually reproduce. $\endgroup$ – MattDMo Mar 19 at 12:47

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