It could be useful to scientist and other professions, because they could study what makes up different DNA and why it is the same in twins.
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Healthy couples having regular ,unprotected intercourse have a 20% to 25% chances of a diagnosed pregnancy within a given menstrual cycle.
The structure of the lipid bilayer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion.