Mrs. Palmer held up a plant with its roots attached during a science lesson. She passed around a sample of the soil that the plant was growing in. She said that plant roots had grown down easily in this type of soil. This type of soil is also a mixture of sand, silt, and clay. What type of soil is Mrs. Plamer describing to her class? A) humus B) loam C) subsoil D) topsoil (this is for science)