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Sagot :
Answer:
The Topsoil layer.
Explanation:
The topsoil layer is a mixture of sand, silt, clay, and broken down organic matter, called humus. Humus is a rich, highly decomposed organic matter mostly made from dead plants, crunched-up leaves, dead insects, and twigs. Topsoil is the home of living things and the materials that they make or they change.
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