Answer:
Surface Horizon (A)
Nutrient depletion of soils is a widespread soil degradation phenomenon that occurs as a consequence of soil erosion<u> (it is the topsoil in which generally most soil nutrients are present that erodes fastest) </u>but also because of poor management practices, such as slash and burn and other subsistence agricultural.
Answer:
Gold
Explanation:
Gold is a singular element according to the periodic table. (Labeled Au), and it does not result from chemical bonds or multiple elements, like all other items listed here do.
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Any non-living factor that is used or present in an ecosystem
Common ones are sunlight oxygen nitrogen climate temperature pH levels and water
A. frameshift
substitution and chromosomal mutations are point mutations
