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A great video lecture conducted by experienced biology teacher on 11th class biology chapter 10 topic1 sub phylum vertebrata. Get full understanding or ask any questions.

Superclass Pisces, ch 10, lec 13, Sub Phylum Vertebrata - Inter Part 1 Biology

7:36

Class Chondrichthyes, ch 10, lec 13, Sub Phylum Vertebrata - Inter Part 1 Biology

11:45

Adaptation to Aquatic Life, ch 10, lec 13, Sub Phylum Vertebrata - Inter Part 1 Biology

10:09