The same is true for sea squirts. Yes, in fish the pharyngeal pouches go on to push through to the outside of the body, and the tissues between the 'slits' develop into the gill bars of bone or cartilage that support the delicate filaments of the gils themselves.
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scrap metal - discarded metal suitable for reprocessing; he finally sold the car for scrap metal. rubbish, trash, scrap - worthless material that is to be disposed of. scrap iron - iron to be melted again and reworked.