Does all litter eventually turn into humus?

Not all litter eventually turns into humus. While organic matter from decomposed plants and animals can contribute to humus formation, various factors such as environmental conditions, microbial activity, and the type of litter influence the decomposition process. Some materials may decompose too slowly or not at all, while others may be broken down completely, contributing to soil health and fertility in the form of humus. Thus, the transformation of litter into humus is a complex process that varies widely.