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Q.

Which of the following organisms bear hollow and pneumatic long bones?

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a

Hemidactylus

b

Ornithorhynchus

c

Neophron

d

Macropus

answer is B.

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Detailed Solution

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In Aves (e.g., Neophron), endoskeleton is fully ossified (bony) and the long bones are hollow with air cavities (pneumatic).

Both mammals and reptiles have ossified bones.

Ornithorhynchus (platypus)  and Macropus (kangaroo) belongs to class Mammalia.

Hemidactylus (wall lizards) is a reptile. 

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