Ontario Grade 9 Destreamed Science (SNC1W1) 2026 Practice Exam - Free Science Practice Questions and Study Guide

Decomposers are organisms that play a critical role in the ecosystem by breaking down dead organic matter, such as fallen leaves, dead plants, and animal remains. This process recycles nutrients back into the soil, making them available for producers, such as plants, to use for growth. Decomposers include fungi, bacteria, and some detritivores, which feed on decaying materials. By decomposing organic matter, they help maintain the balance of ecosystems and support new life, highlighting their essential role in nutrient cycling and energy flow within ecosystems.