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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Recycling HDPE â Type 2 Plastics. 1  HDPE, or type 2 plastics, are high-density polyethylene. These plastics make up the heavier containers that many of our everyday goods are stored in. 2  Many people consider Tupperware to be one of the greatest containers ever made, and of course, it is made HDPE.