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|[[File:Embryo3.png|center|200px]]
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| style="height:20px; width:200px; text-align:center;" |After [[fertilisation ]] the [[ovum]] divides into two [[Cell (Biology)|cells]], then four [[Cell (Biology)|cells]].
| style="height:20px; width:200px; text-align:center;" |This [[embryo]] has many [[Cell (Biology)|cells]] that have not yet been given a specific job.
| style="height:20px; width:200px; text-align:center;" |The [[Cell (Biology)|cells]] in this [[embryo]] are being assigned specific jobs as it starts to look more like a [[human]].
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