Which of the following is / are not characteristics of the class Osteichthyes? I. Body is stream...

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Which of the following is / are not characteristics of the class Osteichthyes?
I. Body is streamlined and mouth is terminal.
II. Gills are covered by operculum.
III. Skin covered with cycloid and placoid scales
IV. Many of them are viviparous
(a) IV only
(b) III and IV only
(c) I, III and IV only
(d) I and IV only
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