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15 July, 03:23

What two features are first seen in the marine worms

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  1. 15 July, 06:03
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    What two features are first seen in the planarians? Planarians have bilateral symmetry, which is associated with the development of a head region, such as that seen in the flatworm. Another feature first seen in the flatworm is the possession of three cell layers: ectoderm, endoderm, and mesoderm (the middle layer).
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