Based on modifications, make the pairs:

incisor: tusks of elephant; _____________: quills of porcupine

Epidermal hair: quills of porcupine

Elephants have long modified tusks called canines which are used for defence. Quills are modified hair embedded in the epidermis of porcupine. These quills are used as defence by porcupine, they shake their tails thus the sound of quills makes distracting noise and runs from predator.