Bilateral symmetry,blastopore forming the mouth (protostome),and a true coelom occur in:

  • A
    Echinodermata
  • B
    Chordata
  • C
    Annelida
  • D
    Platyhelminthes

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The first animal phylum to possess a true coelom is:

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Solid,ventral,one pair of nerve cord found in the members of which phylum?

The first circulatory system is observed in the members of this phylum.

$Parapodia$ are lateral appendages used for locomotion in which of the following organisms?

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