A. 28. Antibiotics are designed to kill certain species of bacteria, but scientists must continually develop new antibiotics to
combat bacterial infections. What is the best explanation for why this is necessary?
Bacteria have evolved through geographic isolation so the old antibiotics are no longer effective.
b. Bacteria have evolved through reproductive isolation so the old antibiotics are no longer effective.
Bacteria have evolved resistance to antibiotics through natural selection so the old antibiotics are no longer
effective.
d. Bacteria cannot evolve, but the scientists are trying to make more money.
c.