Bilateral Symmetry. The remaining phyla are all bilaterally symmetrical or at least have primary bilateral symmetry Also called Bilateria the development of bilateral symmetry is one of the most important traits in higher animals
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Two intermediate hosts
Hydatid cysts can form when larva is ingested by wrong host; example here is in liver of human
which are often inoperable and fatal
THE PROBOSCIS OR RIBBON WORMS