Which of the following is correct statement

  • [AIPMT 1990]
  • A

    In blastulation major presumptive and organ forming areas are segregated into definite points of the blastoderm

  • B

    Blastulation establishes the three germinal layers

  • C

    Blastulation of frog is known as discoblastula

  • D

    Fluid filled space in blastula is known as archenteron

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