Which terms are used to describe the cluster of developing human cells prior to implantation in the uterine wall,and then after implantation

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The term "zygote" is used to describe the cluster of developing human cells immediately after fertilization and before implantation. After implantation, the term "embryo" is used until about the eighth week of development, after which it is referred to as a "fetus."

Which Terms Are Used to Describe the Cluster of Developing