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Most sharks do not lay eggs, but instead bear live young, with the shark fetuses supported by the mother in a manner similar to mammals. Some others have eggs, but the eggs remain inside the mother, with the young living off each other. Of the remainder, some simply lay them on the bottom of the ocean, while others place them in crevices. Some of the bottom-laid eggs have long streamers that grab onto nearby objects and hang on until the young are born.

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