I. | Platyhelminthes | II. | Mollusca | III. | Annelida |
1. | Only I | 2. | Only II |
3. | Only II and III | 4. | I, II, and III |
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1. | An open circulatory system | 2. | A closed circulatory system |
3. | A lymphatic system | 4. | A portal circulation |
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I: | The body is divided into segments only externally. |
II: | There is a serial repetition of at least some organs. |
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I: | is derived from embryonic mesoderm. |
II: | is present on the ventral side during embryonic development in chordates. |
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