What causes delayed implantation in mammals exhibiting embryonic diapause during reproduction?

💡 Explanation

Delayed implantation results from progesterone maintaining the endometrium in a non-receptive state, preventing blastocyst attachment, because progesterone inhibits the necessary signaling for implantation. Therefore, the endometrium remains quiescent, rather than prostaglandin synthesis, altered estrogen, or blastocyst metabolism being primary drivers.

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