Choose the correct combination:

  • A
    $Annelida$ and $Porifera$ are Phyla.
  • B
    $Oligochaeta$ and $Arthropoda$ are Phyla.
  • C
    $Mollusca$ and $Hydrozoa$ are Classes.
  • D
    $Aves$ and $Chordata$ are Classes.

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Explain the organisation of embryonic layers in animals.

The lining of the coelom is formed by which of the following?

Mark the correct answer regarding the given diagram:

Which type of body plan is shown in the given figure?

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