when a human embryo is developing, the embryo produces a special type of hemoglobin not found in infant, child, or adult blood. why does an embryo produce a different type of hemoglobin from an infant, child, or adult?
a. the embryo has different genes from the infant, child, or adult.
b. development and differentiation result in the loss of certain genes.
c. humans have genes for the different types of hemoglobin, which are expressed at different times
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