Final answer:
The detectable smell of Streptomyces may deter predators and attract dispersers like Bactrian camels, aiding in the dispersion and habitat expansion of the bacteria, which is an aspect of natural selection.
Step-by-step explanation:
The highly detectable smell of Streptomyces bacteria may be beneficial for the bacteria in several ways. Streptomyces is known for producing antibiotics, and the smell might be associated with these compounds. This scent could serve as a deterrent to potential predators or competitors, thus granting Streptomyces an evolutionary advantage in their harsh desert environment.
Additionally, the odor might attract certain animals like the Bactrian camels, which could inadvertently help in dispersing the bacteria to new locations, expanding their habitat and reach. This would be analogous to plants that produce fruits which attract animals that eat them and disperse their seeds. Similarly, this dispersion mechanism falls under the category of natural selection, as those bacteria that can attract dispersers and reproduce in new environments are more likely to thrive.