
The energy pyramid illustrates energy transfer across trophic levels. Approximately 10% of energy is transferred between successive trophic levels, meaning each higher level conserves about 10% of the energy from the level below. In this pyramid, T$_4$ is the apex trophic level, and T$_1$ represents the producers at the base. Given T$_4$ contains 1000 J:
\(T_3 = 1000 J \times \frac{100}{10} = 10,000 J\)
\(T_2 = 10,000 J \times \frac{100}{10} = 100,000 J\)
\(T_1 = 100,000 J \times \frac{100}{10} = 100,000 J\)