If fallen foliage in forest, dead trees, and carcasses in the around villages had not been decomposed for years…….

Explanation

i. If fallen foliage in forest, dead trees, and carcasses in and around villages had not been decomposed for years, they will remain as it is in nature.
ii. Complex carbon substances from fallen foliage in forests, dead trees,carcasses, etc., are converted to simpler carbon compounds by decomposers.
iii. Due to decomposition, these carbon compounds easily mix with air, water and soil from where they are again absorbed by plants and incorporated into the food chain.
iv. If these material are not decomposed by decomposers, recycling of various compounds from biotic to abiotic components won't be possible and the ecological balance would be disturbed.