(B) Sponges (Phylum $Porifera$) are primarily asymmetrical organisms. This means that any plane passing through the center of their body does not divi

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(B) Sponges (Phylum $Porifera$) are primarily asymmetrical organisms. This means that any plane passing through the center of their body does not divide them into two equal halves. While a few species may show some radial symmetry,asymmetry is the characteristic feature of the phylum.