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Are these animals cold-blooded or warm-blooded?

Options

  1. ACold-blooded (poikilothermous)
  2. BWarm-blooded (homeothermous)
  3. CBoth A) and B)
  4. DNone of the above

Correct answer

A. Cold-blooded (poikilothermous)

Step-by-step solution

All living members of the class Cyclostomata are ectoparasites on some fishes.Cyclostomes have a sucking and circular mouth without jaws. Cyclostomes have an elongated body bearing 6-15 pairs of gill slits for respiration. Cyclostomes are marine but migrate for spawning to fresh water. After spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean. After spawning, within a few days, Cyclostomes die.The mouth is located ventrally on these animals.The skin is tough, containing min

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