What is the role of subcutaneous fat, called blubber in whales and seals?

Explanation

### Step-by-Step Solution:

1. **Definition of Blubber**: Blubber is a thick layer of subcutaneous fat found in marine mammals such as whales, seals, and walruses. It covers most of their bodies except for their fins, flippers, and flukes.

2. **Energy Storage**: One of the primary roles of blubber is to store energy. The thick, oily layer of blubber acts as an energy reserve that the animals can utilize during times when food is scarce.

3. **Insulation**: Blubber serves as an insulator, helping to retain body heat in cold water environments. This is crucial for survival in frigid oceanic conditions, allowing these animals to maintain their body temperature.

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