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A jawless fish, which lays eggs in freshwater and whose larvae after metamorphosis return to the ocean is

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Important Questions on Animal Kingdom

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Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of phylum:
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Select the taxon that represents both marine and freshwater species.
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Which one of the following living organisms completely lacks a cell wall?
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A marine cartilaginous fish that can produce electric current is: