Evolution of placentotrophy: using viviparous sharks as a model to understand vertebrate placental evolution

@article{Buddle2019EvolutionOP,
  title={Evolution of placentotrophy: using viviparous sharks as a model to understand vertebrate placental evolution},
  author={Alice L Buddle and James U. Van Dyke and Michael B. Thompson and Colin A. Simpfendorfer and Camilla M. Whittington},
  journal={Marine and Freshwater Research},
  year={2019}
}
Reproducing sharks must provide their offspring with an adequate supply of nutrients to complete embryonic development. In oviparous (egg-laying) sharks, offspring develop outside the mother, and all the nutrients required for embryonic growth are contained in the egg yolk. Conversely, in viviparous (live-bearing) sharks, embryonic development is completed inside the mother, providing offspring with the opportunity to receive supplementary embryonic nourishment, known as matrotrophy. Viviparous… 
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