Which of these best demonstrates mutualism between certain types of bacteria and humans? A Intestinal bacteria obtain nutrients from the gut and produce vitamin K used by humans. B Bacteria become resistant to antibacterial medication that humans use for treatment. Invasive bacteria at an area of injury produce toxins that damage healthy tissues of the human body. D Bacteria in improperly prepared food is consumed by humans, causing food poisoning.​

On a map showing the employment density of an urban area that follows the urban realms model, which of following statements best describes what the distribution of jobs might look like? (3 points) jobs closely follow major transit routes. jobs appear to be shifting from the inner to outer core. most jobs are concentrated around the central business district. jobs are distributed roughly in circles. several edge cities contain high numbers of jobs. which of these is not a criticism of the concentric zone model? (3 points) it does not accurately describe cities after the rise of suburban development. it only applies to cities that grew after the development of the automobile. it fails to address the development of cities outside of the united states. it assumes that inner-city areas will always be repurposed instead of abandoned. it places too much importance on the traditional central business district.