Streptomyces are obligate aerobic soil bacteria that infect may root plants,causing scabs on their surfaces.You would expect to find more Streptomyces near the surface of the soil.

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As Streptomyces are obligate aerobic bacteria, they require oxygen for their survival and are more likely to be found near the surface of the soil where there is higher oxygen availability. Additionally, their association with root plants also suggests that they may be found near the surface of the soil where the roots are located.

Streptomyces Are Obligate Aerobic Soil Bacteria That Infect May Root