Assertion: sponge's spicule | /r/HasProperty | preceded by organic substrates
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Source sentences:
text: Furthermore, the evolution of biocalcification in Namapoikia likely requires a pre-existing organic scaffold55, consistent with the hypothesis that fully biomineralized spicules were likely preceded by organic substrates (i.e., precursors of axial filaments) that can be repeatedly and independently recruited to serve as biomineralization templates and catalysts.