Which of the following is NOT a function of decomposers in an ecosystem?

Decomposers play a crucial role in ecosystems by breaking down organic matter, which includes dead plants and animals, as well as waste products. This decomposition process allows nutrients to be recycled back into the soil, making them available for plants and other producers to use, thus supporting plant growth.

While decomposers contribute to nutrient cycling and can enhance soil quality which indirectly supports plant growth, they do not directly provide energy to primary producers. Primary producers, such as plants, convert sunlight into energy through photosynthesis, and it is this process that directly supplies the energy needed for producers to grow and thrive. Therefore, the assertion that decomposers provide energy to primary producers is inaccurate, making it the correct choice as the function that is NOT characteristic of decomposers in an ecosystem.