Q.Give named examples of viviparous fishes and other viviparity examples among chordates.
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Start your 14-day free trial to unlock the full solution →[!ANSWER] Viviparity — giving birth to live young rather than laying eggs — occurs at scattered points across the vertebrate classes, though it reaches its fullest and most familiar expression in Eutheria.
Among fishes, most species are oviparous (egg-laying, with external development), but a number of shark species (and a smaller number of ray and bony fish species) are viviparous or ovoviviparous, retaining fertilised eggs within the mother's reproductive tract, where the embryos develop (in some species nourished directly by the mother, in others simply protected until hatching internally) before live young are eventually born. This is generally understood as an adaptation improving the survival odds of the offspring compared with externally laid, unprotected eggs. …
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