The sperm whale is the largest toothed whale, with adult males measuring up to 20.5 metres (67 ft) long and weighing up to 57,000 kilograms (56 long tons; 63 short tons).
Testicular germ cells that provide an unending source of sperm appear to be able to become embryo-like stem cells able to morph into any cell of the body.
A semen analysis (plural: ... Examples of parameters measured in a semen analysis are: sperm count, motility, morphology, volume, fructose level and pH.
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