Egg has several special extra-embryonic membranes, which allow it to develop on land independent ... carrying nutrients from the yolk back to the embryo. Other extra-embryonic folds expand up over the ...
Because the placenta is derived from the extraembryonic portion ... factor that determines whether an embryo will survive the deep freeze is the amount of membrane damage it incurs during the ...
Egg has several special extra-embryonic membranes, which allow it to develop on land independent ... carrying nutrients from the yolk back to the embryo. Other extra-embryonic folds expand up over the ...
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