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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I have a general avoidance policy towards plastic, particularly disposable plastic. I seek less toxic alternatives to plastics whenever I can. But I make an extra special effort to avoid certain plastics, including polyvinyl chloride (PVC), also known as vinyl or the #3 plastic.The Center for Health, Environment and Justice (CHEJ) calls PVC  the most toxic plastic for childrenâs health and the environment .. Vinyl is the least recyclable plastic because of the diversity of additives used to make different types of PVC products. 2  In addition, when PVC-products are accidentally mixed with non-chlorine plastics, they contaminate the entire recycling process.