To calculate the efficiency of energy transfer from the harbor seal to the polar bear, you can use the formula:
\[ \text{Efficiency} = \left( \frac{\text{Energy received by predator}}{\text{Energy available from prey}} \right) \times 100 \]
In this case, the energy received by the polar bear (predator) is 375 Kcal, and the energy available from the harbor seal (prey) is 2,500 Kcal.
Now, substituting the values:
\[ \text{Efficiency} = \left( \frac{375 , \text{Kcal}}{2500 , \text{Kcal}} \right) \times 100 \]
Calculating this gives:
\[ \text{Efficiency} = \left( 0.15 \right) \times 100 = 15% \]
Therefore, the efficiency of energy transfer between the harbor seal and the polar bear is 15%.