This figure shows the metabolism of glucose and oxygen to CO2 and H2O. From what molecule do the carbon in CO2 and the hydrogen in H2O come from? 
Definitions:
Childbearing Risks
The potential dangers and complications associated with pregnancy and childbirth, affecting the health of the mother and the child.
Fertility
The natural capability to produce offspring, a critical determinant of population dynamics.
Igf2
Insulin-like Growth Factor 2, a protein involved in cellular growth, development, and function, playing a critical role in prenatal growth and development.
Igf2r
A gene that encodes the insulin-like growth factor 2 receptor, involved in various cellular processes including growth, development, and apoptosis.
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