Given the task definition and input, reply with output. Given a scientific question, generate a correct answer to it.

What makes toenails and fingernails hard?

keratin
Given the task definition and input, reply with output. Given a scientific question, generate a correct answer to it.

What makes toenails and fingernails hard?

user
keratin
assistant
Given the task definition and input, reply with output. Given a scientific question, generate a correct answer to it.

What makes toenails and fingernails hard?

keratin