All soil contains some humus. If it doesn't it is not soil.
are good for growing plants
In the first layer.
temperate
bed rock
Topsoil contains organic matter (humus)
topsoil.
3 layers of different kinds of soil is you count humus,5, (humus, topsoil, midsoil, poor soil, bedrock, you can call it 3 though, humus isn't actual soil its dacayed plants and animals)
humus
The C and R horizon
The Fertile soil contains lots of microorganisms which decompose the complex dead bodies of animals and plants into simpler substance called Humus.
podzolic do not have much fertile humus. this causes a bright brown colour.
It is called humus.
how does the presence of humus affect soil
humus is a source of nutrients which makes soil fertile.
Humus was added to it
i am a little primary girl answering this the answer is humus