Mature feathers are dead structures and must be replaced at regular intervals.
Correct Answer:
Verified
Q10: Birds,like reptiles,excrete uric acid as the major
Q11: Archaeopteryx had teeth set in sockets,whereas modern
Q12: The most common type of mating system
Q13: Birds,like mammals,have non-nucleate,biconcave erythrocytes.
Q14: The wing of a modern bird shows
Q16: The supracoracoideus muscles raise the wings in
Q17: Because of the demands of flight,the circulatory
Q18: Most of the birds that migrate breed
Q19: In birds,reproductive organs of both sexes shrink
Q20: The raptors,such as hawks and eagles,are notable
Unlock this Answer For Free Now!
View this answer and more for free by performing one of the following actions
Scan the QR code to install the App and get 2 free unlocks
Unlock quizzes for free by uploading documents