Indicate the difference between annelids and free-living flatworms

1) In annelids, the digestive system is through, and in free-living flatworms, the digestive system is closed
2) Ringworms have a circulatory system that was not present in flatworms
3) In annelids, unlike flatworms, a secondary body cavity appeared, filled with liquid, which is involved in the metabolism and creates support when moving

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