how do soil organisms obtain air ?
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- Plants, animals and micro-organisms (fungi and bacteria) all affect soil formation by producing or contributing to humus production. The amount of humus in a soil is a result of how much plant material has been incorporated into it.
- If vegetation is sparse a soil will be low in humus and less fertile.Soil organisms are also classified according to the way in which they obtain food from their environment.
- These organisms can be either autotrophs, obtaining carbon from air and energy by photosynthesis or oxidation, or heterotrophs, obtaining carbon by breaking down organic materials.
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