The respiratory pigment that contains $Cu$ is -

  • A
    Hemoglobin
  • B
    Hemocyanin
  • C
    Chlorocruorin
  • D
    All of the above

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The spiracle participates in which of the following processes?

$O_{2}$ exchange with $CO_{2}$ by simple diffusion over the entire body surface takes place in:
$I.$ Sponges
$II.$ Coelenterates
$III.$ Flatworms
Select the correct option to complete the given statement.

Which of the following is not a character of a respiratory surface?

Which of the following respiratory organs are present in spiders and scorpions?

Skin is an accessory organ of respiration in

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