Answer:
O.
Explanation:
There are different types of soils and it is made up of different layers or horizon such as A, B, C, O, R and E. Together all the horizons forming soil profile. Each horizon containing different soil types.
O horizon: Known as top layer of the soil which contains layer of organic matter which is about two inches thick, and made up of humus such as decomposing leaves, dark-colored, carbon rich matter, twigs and microbial biomass which is mixed with small grained minerals for the formation of aggregate structures.
The most important factor to consider when selecting sources for an essay is the level of detail provided by the source.
<h3>What factors are considered when selecting a source for an essay?</h3>
When writings essays, it is important that the contents are factual and well-researched.
It is also important that the source materials required for the last to be easily accessible as this will help in the completion of the essay.
However, the most important factor to consider when selecting sources is the level of detail provided by the source.
Learn more about essays at: brainly.com/question/25607827
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Nutrition, respiration ,growth excretion, homestais, reproduction, movement, and sensitivity
Hey I don’t really know a lot about this but there teaching me it in my science and math class
I don't think this is a question
