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In human beings, the hollow ball of cells called a, about b days after fertilisation, burrows into the lining of uterus event called implantation. Blanks a, b respectively are
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Blastocyst, seven
After the formation of the zygote, it enters the uterus in 3-5 days. n the uterus, the cells continue to divide, becoming a hollow ball of cells called a blastocyst. The blastocyst implants in the wall of the uterus about 7 days after fertilization.
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