9 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.
C
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.
QUESTION # 6