The uppermost part of a soil profile is also called the organic layer which is enriched in organic materials. Hence, the region with the greatest concentration of organic material is the Top layer(A)
- The Upper layer of a soil profile consists of materials such as <em>plant roots, bacteria and fungi</em> which constitutes it's richness in organic materials.
- These layer is usually very dark and plants derive a lot of nutrient ’s required for growth here.
Hence, the top layer has the greatest concentration of organic materials.
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B. The various climate zones support biodiversity
At least 80 percent of ocean water is included in the deep zone. The correct option among all the options that are given in the question is option "D". It is a fact that 71 percent of earth is covered by the oceans. Approximately 90 percent of the ocean water is considered deep ocean water and it is mostly a mystery till today.
