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Muarl · Answer 1 · 2021-11-25T08:39:42+0000

Answer:

The fertilized egg (zygote)

Step-by-step explanation:

the egg divides repeatedly as it moves down the fallopian tube to the uterus. First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst.

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