Question

approximately % of the available energy is passed from organisms at one trophic level to organisms at the next trophic level.

Explanation:

Step1: Recall energy - transfer rule

In an ecosystem, the 10 - percent rule is well - known.

Step2: State the energy - transfer percentage

Approximately 10% of the available energy is passed from organisms at one trophic level to organisms at the next trophic level.

Answer:

10