MCQ
Characteristic features such as four-chambered heart, feather and pneumatic bone is applicable to the class of vertebrate
- ACyclostomata
- ✓Aves
- CReptilia
- DMammals
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$b$. Seahorse
$c$. Flying fish
$d$. Sawfish
$e$. Dogfish
$R$ : Epithelial cells are not secretory in nature.
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