The ensure of effectiveness of reproduction and survival of embryo in mammals is :

Formation of yolk sac

Formation of plancenta

Reduced number of eggs

Retention of embryo in female
pls .. explain

Option 4 is correct!

Normal oviductal embryo transport is one of the prerequisites for on-time initiation of implantation in uterus, whereas a dysfunctional regulation of this process resulting from oviductal embryo retention would increase the incidence of pregnancy failure or cause tubal (ectopic) pregnancy in humans.

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