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Blastocycst 10.12:

About six days after fertilization, the cell cluster forms a hollow cavity and is known as a blastocyst. It floats within the uterus for around 48 hours before landing on the thick uterus lining (endometrium), which softens to aid implantation.
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License:[Source CIET, NCERT ]June 13, 2017, 5:37 p.m.

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