Gerri says that a spider use their fangs for the same purpose that crustaceans use their claws. alana disagrees and says that spiders use their fangs for the same purpose that centipedes use their claws. which best explains who is correct?

According to a new study, spider's fangs are considered to be natural needles that they use for piercing the skeletons of prey and delivering the kiss of a venom. The fangs can also be used as a defense mechanism towards their predator or towards humans.

On the other hand, the crustacean's claws, like the crab claws can be used for protection, as well as for communication, excavating burrows, attracting mates and gathering food.

While the centipedes use their claw to grab their prey and inject venom to kill it or to protect itself from being harmed.

Considering these definitions, we can say the Gerri and Alana are both correct since the spider uses its fangs to inject venom like the centipede and to protect itself like the crustaceans.

Distillation.  distillation is the correct answer.