During the cleavage stage, what happens to the zygote?, It increases in size, It forms organs, It undergoes rapid cell division, It implants in the uterus, For the first 30 hours after fertilization, the zygote:, Divides rapidly, Forms a blastocyst, Remains as one cell, Implants in the uterus, The 16-cell stage of early development is called:, Blastocyst, Morula, Embryo, Zygote, The blastocyst is best described as:, A solid ball of cells, A single cell, A hollow ball of cells, A fertilized egg, Implantation usually occurs on day:, . Day 2, Day 6, Day 4, Day 12

Human Development before Birth

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