The first trimester is a critical period for development because events in the first 12 weeks establish the basis for organ formation, a process called ________.
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Q63: Blood flows to the placenta from the
Q64: At about day nine of development of
Q65: Respiratory system changes that occur during the
Q66: The mucous epithelium of the digestive tract
Q67: Each germ layer develops into specific structures.
Q69: _ begins with the attachment of the
Q70: The cells of the blastodisc that face
Q71: The cells of the blastocyst that become
Q72: The muscular system develops from the _.
Q73: The _ begins with the onset of
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