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Sharks have internal fertilization. After fertilization, sharks may have three different kinds of embryo development - depending on the species.
Some are oviparous, which means they lay eggs.
Some are viviparous, which means pups are born live.
Others are ovoviviparous. This can best be described as a combo of oviparous and viviparous. The embryo, which is attached to a yolk sac (to gets its nutrients) develops in the female. After it matures it is then born live.
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