In everyday language, 'fish' is often used loosely, but in biology, a 'true fish' refers to aquatic vertebrates with gills that lack limbs with digits, typically belonging to the superclass Pisces.
Which one of the following is a true fish as per the biological system of classification?
Asked in UPSC CDS 1 2018 · Topic: Taxonomy (Taxonomic Characters and Evidence (Morphological, Anatomical, Cytological, Molecular))
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