These preparations are called Vaccines. A vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing micro-organism and is often made from weakened or killed forms of the microbe, its toxins or one of its surface proteins.
Lit is a lichen,a combination of an algae and a fungi
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What passage
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please provide an example
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I agree this makes complete sense
The answer is C. They destroy the ozone layer
