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WELL  an embryo is what you would call an egg after being fertilized from about 2 to 8 weeks after fertilization. After 8 weeks it is called a fetus
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then then
 embryo and the fetus are both formed  when then sperm and egg fuse  
then fuses differentiates into then embryo and then placenta .
has then fetus has 
than fetus is more developed than then embryo.