Although there are many antibiotics produced by soil organisms, most are not useful in humans. suggest two likely reasons why an antibiotic maynot

The two reasons why antibiotic may not be useful in humans are the following:

They generally target the soil bacteria in which very dissimilar to the virulent strains that infect the human body and can have severe side effects to the human body because some are toxic this would in line for the fact that antibiotics are strongly biologically active making them comprehensive range.

Its either a) or b),wind and water erosion gradually widen the canyon