Biology

Biology, 30.04.2021 04:50, monica1400

Earthworms help farmers. Many farmers add them to their farmland because they help form rich soil to grow crops in. Earthworms mix different layers of soil together by carrying humus from the surface down into the subsoil. Humus is a dark-colored substance made up of a variety of materials. Which two of the following are found in humus?

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