Ecosystems are comprised of various trophic levels, or groups of plants and animals that reflect their main energy source. Ecological pyramids can be used to show the relationship between trophic levels. An ecosystem includes autotrophs and heterotrophs. Organisms from each trophic level, feeding on one another, make up a series called a food chain. In real life, it is rather rare for a given organism to feed only on one other type of organism. Therefore, …showed first 75 words of 663 total…

…showed last 75 words of 663 total…to forget, every single aspect of an ecosystem plays an extremely large role in an ecosystem's survival. Ecological efficiency is the proportion of energy at a certain level that is transferred on to the next level. Usually, only 10% of the energy at one level is transferred on to the next trophic level. The remaining 90% is consumed by the plant or animal for its own metabolic activities, or it is transferred to decomposers when it dies.