Oxygen-poor blood flows out of the heart and into the lungs. Nutrients and oxygen are sent to other cells and parts of the body.
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The attached picture shows how bacteria gain antibiotic resistance. Firstly, a few individuals attain a beneficial mutation in their genetic material that accords them the capability to survive in an antibiotic. The individuals are hence able to survive and reproduce more than those individuals without the mutation. There is, therefore, a genetic shift in the population in favor of the resistant genotype. After generations, the whole population becomes antibiotic resistant.
