Animal phylogenies based on molecular and morphological characters can be different in regards to the placement of the phylum Platyhelminthes. What is the best explanation for this?

Question

Answer

The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom.

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Some Platyhelminthes have a coelom, but others do not and it is difficult to conclude anything about its evolution within the clade.

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Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution.

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Platyhelminthes originated from ancestors with a coelom and have retained it to the present time.

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Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one.

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Animal phylogenies based on molecular and morphological characters can be differ...

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