The primary function of recycling in ecosystems is to facilitate the reutilization of materials, thus reducing waste and promoting sustainability. Recycling ensures that nutrients are returned to the ecosystem, allowing for the continuous cycling of matter within food webs. By breaking down organic materials, organisms enable the transformation of waste into vital nutrients for soil and plant growth. This process is crucial for maintaining ecosystem balance, as it not only minimizes environmental impact but also supports the productivity and health of ecosystems.