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Free with trial Embryonic development refers to the process by which a fertilized egg, or zygote, develops into a multicellular organism. In humans, this process begins with fertilization, when a sperm cell penetrates an egg cell, resulting in the formation of a zygote. Fertilized vectors Phases of embryonic development. Embryonic development refers to the process by which a fertilized egg, or zygote, develops into a multicellular organism. In. Embryonic development refers to the process by which a fertilized egg, or zygote, develops into a multicellular organism. In humans, this process begins with fertilization, when a sperm cell penetrates an egg cell, resulting in the formation of a zygote.
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