First slide
Classification of Animals
Question

Identify the vertebrate group of animals characterized by the presence of 4 pairs of gills.

Easy
Solution

In Osteichthyes 4 pairs of gills are present for the respiration. In Chondrichthyes 5 pairs of gills are present. In Amphibia gills are present only in larval forms. In Reptiles gills are absent.

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