Question

how do earthworms add humus to the soil​

Answer 1

Earthworms help createhumus—a dark brown-black type of soil which holds important nutrients in place for plant growth and use.Earthworms also help create good soil structure; their burrows open up the soil andcreate aeration and drainage 

Answer 2

Worms Help to increase the amount of water and air that gets into the soil.
They Break down organic matter like leaves Grass into things that plant can use .


Hope this will help u