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Which of the following affects natural selection?
  1. Changes to the environment
  2. A small gene pool
  3. Antibiotics
  4. All of the above
Explanation
Answer: D - Natural selection is nature’s way of selecting which organisms survive. Changes to the environment can make an organism prosper or kill it off. A small gene pool can do the same. Antibiotics kill some bacteria, while remaining bacteria thrive and mutate, making the bacteria stronger and more resistant to antibiotics.
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