Explain phylum platyhelminthes, Biology

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Phylum platyhelminthes (13,000 species Flatworm)

The body is flattened. Gastrovascular cavity is branched, dense bodies with many cell layers, mouth but no anus. Hermaphrodite often with elaborate precautions for minimising self-fertilisation. Phylum contains many important parasites.

Three classes:

Turbellaria

Trematoda

Cestoda

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