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Questions and Answers
When is the fetus said to begin to have a human appearance?
Which part of the body is formed by the beginning of the 5th week?
During which period do the tissues, organs, and systems start to form?
Which structure arises as a thickening of the surface epithelium during development?
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How is age usually determined during embryo development?
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At what point are all the main 'systems' of the body established during development?
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