In the egg of a bird,the shell and shell memb | vedclass

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(A) The calcareous shell present around the eggs of birds is porous.This porous nature allows for the gaseous exchange required for the developing emb

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Permeable to $O_2$ and $CO_2$

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(A) The calcareous shell present around the eggs of birds is porous.This porous nature allows for the gaseous exchange required for the developing embryo.Specifically,it facilitates the diffusion of oxygen $(O_2)$ into the egg and carbon dioxide $(CO_2)$ out of the egg.Therefore,the shell and shell membranes are permeable to $O_2$ and $CO_2$.

In the egg of a bird,the shell and shell membranes are:

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