Identify the given animal and choose the correct option. (a) The skin is tough, containing minut...

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Identify the given animal and choose the correct option.
(a) The skin is tough, containing minute placoid scales
(b) It has four pairs of gills which are covered by air bladder
(c) Fertilisation is external and is oviparous
(d) Mouth is located ventrally and jaws are very powerful.
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