decomposition is when a decomposer breaks down dead organisms & an organism is a source of organic material ->  decomposition is when a decomposer breaks down organic material  a microorganism is a kind of decomposer & compost is solid waste in which organic material is broken down by microorganisms ->  compost is solid waste in which organic material is broken down by decomposers  decomposition is when a decomposer breaks down organic material & compost is solid waste in which organic material is broken down by decomposers ->  compost is a solid waste in which decomposition occurs  decomposition is a kind of process & decomposers perform decomposition & if something performs a process then that process relies on that something ->  decomposition relies on decomposers  compost is a solid waste in which decomposition occurs & decomposition relies on decomposers -> compost relies on decomposers to work