Which of the following statements is consistent with $Chordata$?

  • A
    Heart is dorsal or absent
  • B
    Double,ventral and usually ganglionated nerve cord
  • C
    Alimentary canal is ventral to the nerve cord
  • D
    Pharyngeal gill slits are absent

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$A$ rod-like structure formed on the dorsal side during embryonic development in some animals, which is mesodermally derived:

Vertebrates possess which of the following characteristics?

Which of the following are referred to as non-vertebrate chordates?

Formation of notochord or the central axial chord in vertebrates is known as

Assertion $(A)$: $Ascidia$ and $Salpa$ are placed under sub-phylum $Urochordata$.
Reason $(R)$: In $Ascidia$ and $Salpa$,notochord is present only in larval tail.
In the light of the above statements,choose the most appropriate answer from the options given below:

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