Home › AP EAMCET › Biology › Zoology Unit 4: Animal Diversity-II: Phylum Chordata › The long bones of birds are
The long bones of birds are
Asolid and heavy
Bpurely cartilaginous
Cfilled with marrow
Dhollow with air spaces
Answer & Solution
Correct answer: D. hollow with air spaces
Pneumatic bones with air cavities keep birds light for flight.
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