Why Does a Newborn with a Genetic Enzyme Deficiency Have

Why does a newborn with a genetic enzyme deficiency have a normal phenotype at birth?

A) Metabolism during prenatal life is too slow to require full enzyme activity.
B) The deficient enzyme's activity was performed by maternal enzymes before birth.
C) During the fetal phase of life, the newborn was not exposed to the protein that the enzyme is responsible for degrading.
D) Although the newborn cannot synthesize the enzyme after birth, the initially stored enzyme performs its functions until the level is fully depleted.

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