Platyhelminthes are best described as
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Platyhelminthes, commonly known as flatworms, are best described as a phylum of soft-bodied invertebrates. They are characterized by their flat, unsegmented body shape. They lack a true body cavity and have a simple digestive system with a single opening for both ingestion and excretion. Most species are hermaphroditic, having both male and female reproductive organs. Some common examples of platyhelminthes include planarians, tapeworms, and flukes.