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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Types of Plastics. Quick Tips #213. The term plastics describes a group of chemicals called polymers. Heating hydrocarbons (oil, natural gas or coal) produces plastics. This process is called cracking because a catalyst is used to break larger molecules into smaller ones.