Given below are certain adaptations which are seen in various groups of animals:

A. Ovipary

B. Streamlined body

C. Pouch for carrying eggs

D. Porous egg shell

E. Breast bone as large keel

F. Webbed feet

G. Laterally compressed coccygeal bone

H. Unidirectional pulmonary system to provide large quantities of oxygen

I. Barbules or hooklets on the vanes of each feather

Which combination of the above adaptations facilitate bird flight?

1
B, E, H, I
2
A, B, C, G
3
D, F, G, I
4
B, D, E, F

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