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Which are flattened dorsoventrally and have a gastrovascular cavity with one opening?

Which are flattened dorsoventrally and have a gastrovascular cavity with one opening?

جو ڈورسوونٹرلی طور پر چپٹے ہوتے ہیں اور ان میں ایک سوراخ کے ساتھ معدے کی گہا ہوتی ہے؟
Explanation
  • Flatworms are dorsoventrally flattened and have a gastrovascular cavity with a single opening.
  • They belong to the phylum Platyhelminthes.
  • They lack a circulatory system.