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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HDPE or PE-HD. When the little triangle has a 2 inside and the code of either HDPE or PE-HD under it, you know that the plastic it adorns is made from high-density polyethylene. Like PET plastics, HDPE plastics are picked up by most curbside recycling companies.