3. Which of the following is a primary in which proteins are used in the body?
A. Proteins form a layer of insulation
B. Proteins help the body lose weight
C. Proteins provide materials for growth and repairs
D. Proteins provide a quick energy source

Idont know. if you want an answer you need to give us some context dude.

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Answer246 k;