A) Birds
B) Mammals
C) Annelids
D) Molluscs
Correct Answer: A
Solution :
Cleidoic egg are the egg of reptiles and birds that are insulated from the environment by albumen membranes and shell. The calcareous shell present around the eggs of bird is porous and allows diffusion of \[{{O}_{2}}\] and \[C{{O}_{2}}\].
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