Which of the following is true for $Salpa$?

  • A
    Notochord is present in the larval stage.
  • B
    Notochord extends from head to tail throughout the life.
  • C
    It is a freshwater animal.
  • D
    It is a dioecious animal.

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Which one of the following structures is present in all adult vertebrates?

Assertion: Notochord is a mesodermally derived rod-like structure formed on the dorsal side during embryonic development of chordates.
Reason: Notochord is replaced by the vertebral column in the adult vertebrate.

Give a scientific reason: Annelids are considered evolutionary precursors of molluscs.

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Enterocoelous coelom is found in

What do $a$ and $b$ represent in the given chart respectively?

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