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14 = fertilization
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fertilisation
Explanation:
A pair of spinal nerves leaves each segment of the spinal cord. The length of the spinal cord is about 45 cm in men and 43 cm in women. The spinal cord is shorter than the length of the bony spinal column; the spinal cord extends down only to the last of the thoracic vertebrae.
Fertilization, union of a sperm nucleus, of paternal origin, with an egg nucleus, of maternal origin, to form the primary nucleus of an embryo.
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