And what is the human zygote? A medical dictionary defines it: “The first diploid cell that forms following fertilization by fusion of the haploid oocyte (egg) and spermatozoa (sperm) resulting in the combination of their separate genomes.”
It is the fusion of the female egg and the male sperm, right after the moment of conception. It is about 2 millimeters in diameter, or the size of the letter “m” on this newspaper.
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