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To find the efficiency of energy transfer using the provided formula, we can plug in the numbers:
Given:
- Energy level transferred to the next level (polar bear's energy) = 375 Kcal
- Total energy input (harbor seal's energy) = 2,500 Kcal
Now, using the formula:
\[
\text{Efficiency} = \left(\frac{\text{Energy level transferred to next level}}{\text{Total energy input}}\right) \times 100
\]
\[
\text{Efficiency} = \left(\frac{375 \text{ Kcal}}{2500 \text{ Kcal}}\right) \times 100
\]
Calculating this gives:
\[
= (0.15) \times 100 = 15\%
\]
Thus, the efficiency of energy transfer between the harbor seal and the polar bear is **15%**.