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Select the correct explanation for the labels A, B, C and D.


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The correct answer is:
D represents the blastocyst implantation.
In the given figure A represents fusion of male and female gametes, $B$ is 4 celled blastomere. $\mathrm{C}$ shows the morula stage, i.e., an embryo with 8 blastomeres and D is the blastocyst which gets implanted in the uterus.
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