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I believe the answer is b.
Antibiotics are small molecules that are used to treat diseases that are caused by organisms
Vaccines are used to prevent infection to a particular disease.
Hope this helps!
If there was any air conditioning making the bubbles go in different directions. If you used more solution than you did with other. Bubbles if you didn’t blow the same amount of times for each bubble. If you didn’t blow with the same air flow
