Which statement regarding birds and reptiles is correct?
A. birds are endothermic and reptiles are ectothermic
B. birds and reptiles are amniotes
C. bird feathers and reptilian scales contain keratin
D. all of the above
Answer: D
Which statement regarding birds and reptiles is correct?
A. birds are endothermic and reptiles are ectothermic
B. birds and reptiles are amniotes
C. bird feathers and reptilian scales contain keratin
D. all of the above
Answer: D