Stem cells are long, threadlike structures composed of twisted parallel strands of deoxyribonucleic acid.
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Q66: Cells that have mutated or spontaneously changed
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Q68: The fetal period of prenatal development lasts
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Q72: A teratogen is a harmful agent or
Q73: As the neural tube expands during development,
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Q76: By the fourth month of prenatal development,
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