“The formation, maturation and meeting of a male and female sex cell are all preliminary to their actual union into a combined cell, or zygote, which definitely marks the beginning of a new individual. The penetration of the ovum by the spermatozoon, and the coming together and pooling of their respective nuclei, constitutes the process of fertilization.”
Leslie Brainerd Arey, “Developmental Anatomy” seventh edition space (Philadelphia: Saunders, 1974), 55
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