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The phenomenon of the adaptation of bacteria and viruses to human beings is known as:

  1. Evolution

  2. Natural selection

  3. Obligate

  4. Antibiotic resistance

The correct answer is: Antibiotic resistance

Bacteria and viruses are constantly evolving and developing new adaptations to survive in various environments. The process of developing resistance to antibiotics, which were originally used to treat their infections, is known as antibiotic resistance. Option A (Evolution) is incorrect as it is a broad term used to describe the gradual accumulation of genetic changes over time. Option B (Natural selection) is also incorrect as it refers to the process by which individuals with advantageous traits are more likely to survive and reproduce, while those with disadvantageous traits are less likely to do so. Option C (Obligate) is incorrect as it refers to organisms that are physically and physiologically dependent on other organisms to survive.