What substances move freely through the shell of the egg?

The correct answer is gases oxygen and carbon dioxide, which diffuse freely across the shell of an egg.  

The four specialized membranes of the amniotic egg are amnion, chorion, yolk sac, and allantois. The chorion and the allantois exchange gases between the embryo and the air. Oxygen and carbon dioxide diffuse freely across the shell.  

An eggshell refers to the outer covering of a hard-shelled egg and of some kinds of eggs with soft outer coats. The shells of the amniotic eggs are calcareous, formed of calcium carbonate.  

answer; a male inherits only one allele of the x-linked gene controlling hair color;

the answer is otpion c) understanding

he wants to be heard one more time. he wants to be understood. he needs the truth one more time.