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A '''human embryo''' is the first stage of human development.
A '''human embryo''' is the first stage of human development.
It is formed by the fusion of the male gamete (spermatozoa or "sperm") and female gamete (ova or "egg"). This is called fertilization and usually occurs in the proximal portion of the female reproductive tract.
It is formed by the fusion of the male gamete (spermatozoon or "sperm") and female gamete (ovum or "egg"). This is called fertilization and usually occurs in the proximal portion of the female reproductive tract.