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Because of the free- rider problem,
Oxygen and Nutrients
Essential components for the survival of cells and organisms, providing energy and maintaining basic functions.
Placenta
An organ that develops in the uterus during pregnancy, facilitating the exchange of nutrients, blood, and waste products between mother and fetus.
Fetus
The developmental stage of a human being in utero from the end of the eighth week after conception until birth.
Miscarriages
The spontaneous loss of a pregnancy before the fetus can survive outside the uterus, typically before 20 weeks of gestation.
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