Question

It flying birds and fossil Archaeopteryx? A. long, bony tail. B. synsacrunm C. separate tibia and fibula D. sternum with a keel E. flight feathers F. claws on the wings G. teeth 7. Which of the following is absent in a modern flightless bird, such as an ostrich or a kiwi, but is present in a living flying bird? A. coracoid bone and clavicle B. synsacrum C. sternum with a well-developed keel D. fused tibia and fibula 8. Which of the following features correctly describes the appearance of feathers? A. Feathers appeared in early members of the bird lineage long before there was evidence of flight. B. Feathers are found only in small (pigeon sized) bird ancestors. C. Feathers are found only in bird ancestors that were capable of flight. D. Feathers are found only in fossil or living members of the Class Aves. 9. The flow pattern of air through a bird's respiration system is: A. Anterior air sacs parabranchia >posterior air sacsout the trachea. B. Posterior air sacs > parabranchiaanterior air sacsout the tracheae. C. Parabranchia anterior and posterior air sacsout the trachea. D. Anterior and posterior air sacs -parabranchia out the trachea.

Answer 1

6) Flight feathers

Flight feathers were common in Archaeopteryx and modern day birds and from these structures feathers for dinosaurs have evolved.

7) Sternum with well developed keel

Sternum when joined with keel helps in proper joining of bones for flying and which is lacked by the flightless birds and are unable to fly.

8) Feathers appeared in early members of the bird lineage long before there was evidence of flight

Feathers appeared long before in common ancestors before there was any evidence of fight. The common ancestors has led to development of flightless birds and bird with flight

9) Posterior air sacs to parabranchia to anterior air sac to out the trachea

Air enters through trachea travels to posterior air sac and then fills the lungs and from their it enters the anterior sac and empties it then leaves out through trachea.