Lets say you have to pick between the two. You [i]will[/i] get attacked one way or the other but which would you prefer? You can't just be like "Nuh im 2 cool 4 sherks or allgatres"
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While both animals jaw-shear, a sharks teeth are designed for cutting, while an Alligators are meant for holding. When a shark jaw-shears it does so to cut away a chunks of flesh, a gator shears to rip a chunk away... you tell me, would you rather have your arm bit from you or ripped off you?