Answer:
B. A walrus stays warm in cold oceans
Step-by-step explanation:
Lipids are the macromolecules that are stored in adipose tissues and beneath the skin surface. These lipids layer present under skin serve as insulators.
Many organisms found in colder climatic conditions such as walrus of cold oceans have a thick layer of lipids under their skin. This lipid layer is called blubber and keeps the organism warm under cold conditions.