write any five differences between Chondrichthyes and osteichthyes
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Characteristics Chondrichthyes Osteichthyes
Type of scale present on skin Placoid scales Scales absent, if present, cycloid scales
Number of gills present 5-7 pairs of gills, not covered by operculum 4 pairs of gills, covered by operculum
Caudal fin Heterocercal Homocercal
Excretory waste Urea Ammonia
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