Available choices:
[i] tail fins.
[ii] Animal fur.
[iii] fur seals.
[iv] keratin.
[v] nitrogen.
[vi] snow.
[vii] Epidermis.
[viii] poultry.

Fact 1: Hair helps to insulate and protect the body. Fact 2: Hair is composed of the protein keratin. Given the two facts above, what helps to insulate and protect the body?
Answer:
[iv]