Given a scientific question, generate a correct answer to it.

Ex Input:
Chewing a bite of bread mixes it with what and facilitates its chemical breakdown?

Ex Output:
saliva

Ex Input:
How much work is done when a force is applied in a different direction than the direction of movement?

Ex Output:
none

Ex Input:
A hair grows out of a follicle and passes through what before extending above the skin surface?

Ex Output:
epidermis