Which of the following is not a key difference between birds and other reptiles? a. mode...

Which of the following is not a key difference between birds and other reptiles?

a. mode of thermoregulation

b. timing of eggshell secretion

c. keratin feathers

d. bone density

Expert Solution

Answer - c) keratin feathers
mode of thermoregulation - Reptiles- they are pokilotherms, and have scales throughout their body and birds are homeotherms,while they don't have scales throughout body . As birds are warm blooded ones, it can regulate temperature, they also have wings- so birds and reptiles are different with reference to this character.
timing of eggshell secretion- in repties- after 24 hours , after ovulation, the process of eggshell secretion begins , in birds- also after about 20-22 hour the eggshell secretion begins,
keratin feathers- both have beta keratin in their fathers- hence answer, which gives a water-proof and also help them in escaping from dessication.
bone density- pneumatic bones are present in birds, while no pneumatic ones in reptiles- enabling birds to fly, so birds have lower bone density than reptiles.

gladiator answered 2 years ago

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