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embryonic |
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| The embryonic period encompasses the first 8 weeks of human development; the Carnegie system classifies this period into 23 stages or levels of development. The other 3 embryonic periods, including embryonic development, postembryonic development, and emergence stage of the 1st breathing pore, also showed the similar trends with variations in temperature. Furthermore, eight weeks is designated by scientists as the end of the embryonic period and the beginning of the fetal period. |
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