If a bird's egg is coated with varnish and th | vedclass

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(C) The eggshell of a bird is porous,allowing for the exchange of gases ($O_2$ and $CO_2$) between the developing embryo and the external environment.

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dies due to a decrease in $O_2$ levels.

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(C) The eggshell of a bird is porous,allowing for the exchange of gases ($O_2$ and $CO_2$) between the developing embryo and the external environment. When the egg is coated with varnish,these pores are blocked. As a result,the developing embryo cannot obtain the necessary $O_2$ for respiration and cannot eliminate the $CO_2$ produced. Consequently,the embryo dies due to suffocation caused by the lack of $O_2$ and the inability to perform gas exchange.

If a bird's egg is coated with varnish and then incubated,it will not hatch because the developing embryo...

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