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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In a nutshell, PVC plastic is uniquely toxic among plastics because of its highly toxic ingredients which readily migrate into the environment during its production, its use, and its disposal.Pure PVC plastic is 57% chlorine, a toxic substance whose production generates substantial pollution (see below). 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.