Question

why is crab not an amphibian

Answer 1

Crab belongs to the phyllum arthropoda.Crabs are not cold-blooded, they do not have heart.They lack all the characteristics of an amphibian.

Answer 2

Although crabs can live on land and in water,but they are not amphibians.Crabs have different body features than amphibians.They do not have lungs like amphibians.They donot have vertebral colomn like amphibians.They do not have nervous system nervous system.Crabs are arthropods.