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vertebrates

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• Shark eggs are fertilized internally but<br />

embryos can develop in different ways:<br />

– Oviparous: eggs hatch outside the mother’s<br />

body<br />

– Ovoviviparous: the embryo develops within the<br />

uterus and is nourished by the egg yolk<br />

– Viviparous: the embryo develops within the<br />

uterus and is nourished through a yolk sac<br />

placenta from the mother’s blood

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