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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There are two main types of recycled plastic: PET, or #1 plastic, can be translucent or tinted, making it the clear choice for water and soft drink bottlesâthough the higher the percentage of recycled material, the more discoloration that occurs, says Marny Bielefeldt, marketing manager at St. Louis-based Alpha Packaging.