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Health, 05.08.2019 00:50, kcarstensen59070

What is a blastocyst? a zygote covering to prevent sperm from entering a two-celled developing structure a sphere of cells surrounding a hollow center a solid mass of about one thousand cells

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Place the events of fertilization and implantation in order. 1. implantation of the developing embryo. 2. the developing embryo becomes a blastocyst which consists of a hollow ball of cells. 3. mitosis occurs in the fallopian tube. 4. the cortical reaction occurs, preventing polyspermy. 5. the egg is fertilized by the sperm.

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