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A lot! Obviously they are both fish, but sharks are members of the class Chondrichthyes (or cartilaginous fish) and piranhas belong to Osteichthyes (bony fish), along with the majority of fish species. They are taxonomically separated after phylum, so pretty early on in the system. There are more physical differences, such as the fact that most sharks are salt water and piranhas live in fresh water, but that is the biggest difference.

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10y ago

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