Health professionals sometimes recommend nutritional supplements that contain a variety of species of bacteria to promote good digestive health. the product label for one of these supplements is shown above. why does this type of bacteria-filled supplement benefit human health instead of causing illness? a) stomach acids and digestive enzymes kill the bacteria in this type of supplement, protecting the person against future infections by live organisms. b) the human digestive system contains billions of beneficial bacteria that enhance digestion and nutrient absorption, synthesize vitamins, and limit the growth of harmful bacteria. c) these species of bacteria remove all the other species of microorganisms living in the human digestive system and ensure that no microorganisms survive to contaminate the body. d) these bacteria are able to deactivate viruses that may inhabit the human digestive system and are used to protect against further viral infections.