What are the rule of 2's for the 2nd week of development?



What are the rule of 2's for the 2nd week of development?..

Answer / biomaster

1) 2 germ layers: epiblast & hypoblast

2) cavities: amniotic cavity & yolk sac

3) 2 components to the placenta: cytotrophoblast &
syncytiotrophoblast.

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