What are two ways sharks can be distinguished?

Sharks have small pectoral fins that are very distinct from their body. Sharks also have caudal fins on their tails, which are long and bulkier.

Shark fins typically tend to be more triangular in shape. The leading edge of the dorsal fin might have a little curve to it depending on the species, but generally, the back edge of the dorsal fin that points towards the tail is pretty squared off or flat.

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.