Question

q 25. the efficiency of trophic transfers (energy available to the next level) in ecosystems is on average around

Explanation:

In ecosystems, the 10 - percent rule states that on average only about 10% of the energy available at one trophic level is transferred to the next trophic level. This is due to energy being lost as heat during metabolic processes, used for an organism's own life - sustaining activities, etc.

Answer:

10%