Which of the following statement is incorrect w.r.t. class Cyclosto...
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Which of the following statement is incorrect w.r.t. class Cyclostomata?
\( \mathrm{P} \)
(1) The members are ectoparasites on some fishes
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(2) Their body is devoid of scales and paired fins
(3) Circulation is of open type
(4) They are marine but migrate for spawning to fresh water
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