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I think you're looking at this the wrong way. Animals evolve to fill niches. Many, many land animals returned to the water as a place to live, including: whales, dolphins, porpoises, seals, sea lions, walruses, manatees, dugongs, otters, hippos, pygmy hippos, crocodiles, sea snakes, sea turtles, river turtles, river snakes, etc. etc. etc. Their ...


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Reading this website (www.sharks-world.com/shark_reproduction) it seems that for most sharks the eggs develop inside the mother (ovoviviparity), and the young sharks ("pups") are born fully functional, but this is not true for all sharks (as you mention in your question). This persons blog (morgana249/modern reptiles give birth to live young) discusses ...


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Many species of Eel (order Anguilliformes) have a semelparous life history (most species? all?), i.e. they only reproduce once and then die (as opposed to an iteroparous life history). Many species are now threatened by extinction (e.g. American eel and European eel), since they have been heavily exploited by fisheries and they are also vulnerable to habitat ...



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