What is organic material such as leaves or twigs that may be changed to humus by decomposing organisms?

Organic material such as leaves or twigs that can be transformed into humus through the process of decomposition is known as plant litter. This material is broken down by decomposing organisms like bacteria, fungi, and insects, which recycle nutrients back into the soil. As these organisms break down the plant litter, it eventually turns into humus, enriching the soil and improving its fertility and structure. This process is essential for maintaining healthy ecosystems and supporting plant growth.