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1. Male initiated: Up to 600 million sperm are deposited in the birth canal, of which only 200 reach the fertilization site in the uterine tube.  The Developing Human: Clinically Oriented Embryology, 10th ed., K. Moore et al., Elsevier (2016), pp. 25-26. 2. Male initiated: An enzyme produced by the prostate helps liquify the semen…