| http://www.w3.org/ns/prov#value | - It also cushions the yolk and embryo and keeps them from drying out.Shell membranes that help seal moisture in, and through which oxygen enters the egg and carbon dioxide and other waste gases produced by embryonic metabolism exit.A hard but porous shell that helps protect the embryo from environmental threats, is a source of minerals during embryo growth, and is involved in gas exchange between t
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