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Which of the following is correct about Cyclostomata?
(a)Ectoparasitic on fishes during their adult stage
(b)Skin with scales and unicellular mucous glands
(c)One kidney for excretion
(d)Two chambered heart and 4 pairs of gills slits for respiration

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Important Questions on Animal Kingdom
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Correct statement/s regarding open circulatory system is/are-

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