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Is there a specific reason for this evolution? Are no egg-laying animals more complex beings so their embryonic development requires more time and better nutrition conditions?

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  • $\begingroup$ Oviparity to viviparity (and vice versa and middle ground with ovoviparity) has evolved a number of times. Is there a specific lineage you have in mind when asking this question? $\endgroup$ – Remi.b Jun 17 at 20:38
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    $\begingroup$ Wikipedia > viviparity#evolution will probably give some useful information $\endgroup$ – Remi.b Jun 17 at 20:40
  • $\begingroup$ No I think that first appeared oviparity an then viviparity. $\endgroup$ – liontass Jun 17 at 20:40

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