Question

according to the 10% rule, why are there fewer top-level carnivores than producers in an ecosystem?
carnivores are more efficient in energy conversion.
energy is lost as it moves through trophic levels.
top-level carnivores reproduce faster.

Explanation:

Step1: Understand the 10% rule

The 10% rule states that only about 10% of the energy from one trophic level is passed on to the next.

Step2: Analyze energy flow

Producers (first trophic level) convert sunlight into energy. When herbivores (second trophic level) eat producers, they only get about 10% of that energy. Then, when carnivores (higher trophic levels) eat herbivores, they again get only about 10% of the herbivores' energy.

Step3: Relate to population size

Since so much energy is lost at each trophic level, there is less energy available to support top - level carnivores. Fewer resources (energy) mean a smaller population size compared to producers which have access to a large amount of initial energy (from sunlight).

Answer:

B. Energy is lost as it moves through trophic levels.