By the end of the two-week germinal period, the single-celled zygote develops into a cluster of cells called an embryo.
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Q34: By the third week after conception, a
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Q36: The fetal brain is constantly changing, forming
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Q38: Chronic stress, depression, and anxiety during pregnancy
Q40: Stem cells can divide indefinitely, renew themselves,
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Q42: Parents in all cultures tend to use
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Q44: For the first few months after birth,
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