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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A scrap is a little leftover bit of something. You might jot down notes on a scrap of paper, or you might toss a scrap of food to your happy dog. A scrap is typically a small item that originally was part of something larger, like a scrap of fabric that was once part of a larger piece. Scrap can also describe something thatâs no longer useful. For example, you might take scrap metal to the recycling center. Scrap also has a verb form that means discard..