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Long hollow bones connected by passages are characteristics of
Option: 1
Aves
Option: 2
Mammals
Option: 3
Reptiles
Option: 4
All land vertebrates
Answers (1)
As we have learned
Body of aves -
Body is boat shaped and streamlined. Legs (Hind legs) bear horny epidermal scales. Endoskeleton is fully ossified and long bones are hollow with air cavity.
- wherein
Skin is dry without glands except the oil gland (preen / uropygeal) at the base of tail.
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