Assertion: shark's number | /r/CapableOf | vary by specie
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Source sentences:
text: Though exact numbers vary by species, sharks can have up to 15 series of teeth in each jaw, with one line after the other going from largest and most functional up front back to smaller and less powerful.
text: The number of shark pups in a litter varies among species; the sand tiger shark gives birth to one or two, while the viviparous blue shark has been known to give birth to 134 pups in one litter [source: