Fetal development
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conception | zygote: | fertilized egg |
7-10 days | blastocyst: | inner group of cells, which will become the embryo, surrounded by an outer shell, which will become the placenta |
1-3 months | embryo: | highly differentiated |
11th week to birth | fetus: | Recognizably human. Heartbeat. Smiles, "walks," "breathes," reacts to pain. |