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The zygote is the earliest developmental stage. The zygote has zona pellucida, cytoplasm, 2 polar corpuscles, and 2 pronuclei. When a zygote undergoes rapid cell division eventually develops into an embryo.
First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.