Answer: Lactobacillus Acidophilus and Other Lactobacilli.
Explanation: Streptomyces is used in making antibiotics.
I think it's B. Because if you're wearing something that filters oxygen (E.g. gas mask) and the substance becomes airborne, the filters in the protective gear might be overworked if the substance density is greater than the filtering capacity.
Red blood cells are found in blood vessels!
D is the answer hope it helps
Atherosclerosis I believe
