Concept:Energy transfer in an ecosystem has low efficiency at each step, but the most inefficient step is the initial capture of sunlight by producers.
Explanation:Producers, mainly green plants, convert only about
1% of the sunlight they receive into chemical energy.
In contrast, about
10% of the available energy is transferred from one trophic level to the next.
Therefore, the link from the sun to producers has a much lower efficiency than the link between consumers or between producers and primary consumers.
This makes the sun-to-producer step the least efficient energy transfer in the ecosystem.
Answer:B. sun to producers