Padding and insulation

A) Carbohydrates
B) Lipids
C) Proteins
D) Nucleic acids

Insulation

Materials or substances used to prevent the transfer of heat, electricity, or sound from one area to another.

Lipids

A group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins, and others, serving as a major energy source and structural components of cells.