Question

multiple choice question
in mammals, hair is made of ____ and functions in ____.
keratin; conserving body heat
keratin; absorbing nutrients from the environment
collagen; absorbing nutrients from the environment
collagen; conserving body heat

Explanation:

Mammal hair is composed of keratin. Hair helps mammals conserve body heat by providing insulation. Collagen is a different protein (found in connective tissues like tendons, not in hair). Hair does not absorb nutrients from the environment.

Answer:

keratin; conserving body heat