With the current knowledge. We know that the process of development to a soft (development) from. When reproductive cells (eggs and sapoem). Remove the substance from the father and the mother's genetic half came together as each cell with 23 chromosome pairs these are eggs that have been fertilization (fertilized egg, or zygote, also known as), and then onwards to the cells gradually for about two weeks. Reproductive biologist who proposed to use the term "pre-embryo for calling young at this stage, rather than use the word embryo.
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