Identify the human development stage and its correct site of occurrence in a normal pregnant woman:
Blastula - End part of fallopian tube
Blastocyst - Uterine wall
8-celled morula - Starting point of fallopian tube
Late morula - Middle part of fallopian tube
The morula continues to divide and transforms into a blastocyst as it moves further into the uterus. The blastomeres in the blastocyst arrange into an outer trophoblast and an inner cell mass. The trophoblast layer then attaches to the endometrium, and the blastocyst becomes embedded in the uterine wall, a process called implantation , .
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