Biology for IGCSE & O level - Organisms And Their Environment (Section 1 - No. 19)

What is the most efficient way for humans to increase the amount of energy available to them from an ecosystem?

Eating only secondary consumers

Eating only primary consumers

Eating a variety of producers and consumers

Eating only decomposers

Eating lower trophic levels (primary consumers) provides more energy because energy is lost at each level.