Morula is a solid ball of cells during early embryonic development and consists of:

1. 4 – 8 cells 2. 8 – 16 cells
3. 24 – 30 cells 4. 60 – 72 cells
Subtopic:  Implantation |
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The trophoblast cells of the blastocyst form:

1. Embryo 2. Umbilical cord
3. Placenta 4. Teratoma
Subtopic:  Implantation |
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Implantation in humans occurs at the stage of:

1.  Zygote 2.  Morula
3.  Blastocyst 4.  Gastrula

Subtopic:  Implantation |
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