The Early Development. Janay Rocha Biology Pre AP Day B, Period 2 16 April, 2012. After the first cell division. The zygote forms two cells, the developing animal is called an embryo. The embryo continues to undergo mitosis and cell division, forming a solid ball of cells.
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Biology Pre AP
Day B, Period 2
16 April, 2012
This is an embryo at the 16-cell stage, when it is changed from a zygote to a morula.