Respiration in cephalochordates occurs through

  • A
    General body surface
  • B
    Gills
  • C
    Tracheole
  • D
    Lungs

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The notochord is derived from which germ layer?

Provide definitions/explanations for the following terms:
$(i)$ Cephalochordata
$(ii)$ Pseudocoelomates

Which of the following organisms possess a notochord only in the larval stage?

In which of the following is the $rotatory$ $organ$ (wheel organ) found?

Name the following:
$A$ chordate animal having flame cells as excretory structures.

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