hich of the following rows identifies the structure responsible for maintaining the endometrium before implantation, and the structure that implants into the endometrium, respectively? Select one: a. Structure that maintains the endometrium         Structure that implants in the endometrium         Placenta Zygote b. Structure that maintains the endometrium         Structure that implants into the endometrium          Corpus luteum Zygote         c. Structure that maintains the endometrium         Structure that implants into the endometrium          Corpus luteum Blastocyst d. Structure that maintains the endometrium Structure that implants in the endometrium         Placenta Blastocyst

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