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Embryo is the earliest stage of development of an organism when it has not even reach to a distinctively recognizable form. After fertilization the cell which is formed by the fusion of male and female gametes is called zygote. Zygote gradually divides and develops into an embryo.

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After fedtilisation i.e. fusion of sperm and ovum, zygote divides to form embryo it is earliest stage of a child.
When the embryo is developed for 9 months it forms a foetus.